Merge branch 'feat/api-v2-writes'

- v2: register, get, cancel and checkout a registration (owner/admin only).
- Registration create/cancel moved to src/services/registrations.ts and online checkout to
  src/services/payments.ts; v1 controllers call the same services (ServiceError carries status).
- Typed frontend calls: npm run api:types writes openapi.json and schema.d.ts; apiV2() helper.
  Register page, Pay now and My Events cancel use v2; apiFetch reads v2 errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ls1vMdg2GYqbnKZmPaX1ot

CHANGELOG.md

@@ -7,6 +7,29 @@ and this project follows [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## [1.51.1] - 2026-10-29
+
+### Added
+
+- **API v2 registrations and payments:** `POST /registrations` (signed in, guest for free
+  events, or a waitlist link), `GET /registrations/{id}`, `POST /registrations/{id}/cancel` and
+  `POST /registrations/{id}/checkout` (online payment, with an optional donation; answers
+  `priceUpdated` with the new balance when an early-bird price ran out). Owners only (admins too);
+  someone else's registration is `NOT_FOUND`.
+- **Services in TypeScript:** making and cancelling registrations moved from
+  `registrationController.js` to `src/services/registrations.ts`, and paying a registration
+  online from `paymentController.js` to `src/services/payments.ts`. v1 and v2 run the same code;
+  `ServiceError` carries the HTTP status. `registrationController.js` is ~560 lines shorter.
+- **Typed frontend calls:** `npm run api:types` (repo root) writes the OpenAPI document to
+  `frontend/src/lib/api-v2/openapi.json` and generates `schema.d.ts` from it (openapi-typescript);
+  `apiV2(method, path, { params, query, body, authToken })` in `frontend/src/lib/apiV2.ts` checks
+  the path, parameters, body and answer. A backend test fails while the saved document is stale.
+
+### Changed
+
+- The register page, "Pay now" (registration success page and My Events) and cancelling on My
+  Events use API v2. `apiFetch` reads v2 errors (`error.message`, with `code`/`fields` in `data`).
+
 ## [1.51.0] - 2026-10-29
 
 ### Added

FEATURES.md

@@ -890,7 +890,9 @@ can't start, the same jobs run on in-process timers.
   set.
 - Unhandled promise rejections are logged and don't crash the server.
 - Backend status page (`/`) and built-in API docs page (`/docs`); **API v2** (`/api/v2`, 1.51.0)
-  with one error shape, paged lists and an OpenAPI 3.1 reference at `/docs/v2` (admins).
+  with one error shape, paged lists and an OpenAPI 3.1 reference at `/docs/v2` (admins). Public
+  events, my account and registrations, registering, cancelling and paying online (1.51.1); the
+  frontend's v2 calls are typed from the OpenAPI document.
 - **TypeScript backend** (1.51.0): `.ts` files are checked strictly, `.js` compiles as it is;
   deploys build `dist/`, which `src/index.js` runs.
 - **Tests** — Jest unit tests in `backend/tests` (`npm test`), and Playwright

WHATS-NEW.md

@@ -12,6 +12,11 @@ Write for church admins, not developers: no environment variables, endpoints or
 developer log is CHANGELOG.md. A tagged version without a section here shows "No details given".
 -->
 
+## 1.51.1
+
+- **More groundwork for 2.0.** Registering, paying online and cancelling now run on the new
+  version of the server's connection to the app. They work just as before.
+
 ## 1.51.0
 
 - **Groundwork for Cross Events 2.0.** Behind the scenes, the server is moving to a newer, safer

backend/API_DOCUMENTATION.md

@@ -6,7 +6,8 @@ Full interactive docs (with request/response examples) are available at `GET /do
 > (admin token), the document at `GET /api/v2/openapi.json` (admin). It is generated from the route
 > declarations, so it is not repeated here. v2 responses are `{ data }` (lists add
 > `meta: { page, limit, total, pages }`, `?page=&limit=` up to 100) and errors
-> `{ error: { code, message, fields? } }`. This file documents v1 (`/api/…`), which stays until 2.0.
+> `{ error: { code, message, fields? } }`. This file documents v1 (`/api/…`), which stays until 2.0. The frontend calls v2 through the typed
+> `apiV2()` helper (`frontend/src/lib/apiV2.ts`, types regenerated with `npm run api:types`).
 
 All authenticated requests require:
 ```

backend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "event-management-backend",
-  "version": "1.51.0",
+  "version": "1.51.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "event-management-backend",
-      "version": "1.51.0",
+      "version": "1.51.1",
       "hasInstallScript": true,
       "dependencies": {
         "@prisma/adapter-pg": "^7.10.1",

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "event-management-backend",
-  "version": "1.51.0",
+  "version": "1.51.1",
   "description": "Event Management System Backend",
   "main": "src/index.js",
   "scripts": {
@@ -16,7 +16,8 @@
     "migrate:env-to-db:dry": "node scripts/migrate-env-to-db.js --dry-run",
     "set-demo": "node scripts/set-demo.js",
     "build": "tsc -p tsconfig.json && node -e \"require('fs').writeFileSync('dist/build.json', JSON.stringify({ version: require('./package.json').version, builtAt: new Date().toISOString() }))\"",
-    "typecheck": "tsc -p tsconfig.json --noEmit"
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "openapi": "tsx scripts/openapi.ts"
   },
   "dependencies": {
     "@prisma/adapter-pg": "^7.10.1",

backend/scripts/openapi.ts

@@ -0,0 +1,22 @@
+/**
+ * Writes the /api/v2 OpenAPI document to frontend/src/lib/api-v2/openapi.json, from which the
+ * frontend's types are generated (`npm run api:types` in the repo root does both). Run it after
+ * adding or changing a v2 route; tests/v2.test.ts fails while the saved copy is out of date.
+ */
+import 'dotenv/config';
+import fs from 'fs';
+import path from 'path';
+import { buildOpenApi } from '../src/v2/openapi';
+import '../src/v2';
+
+export const OPENAPI_FILE = path.join(__dirname, '..', '..', 'frontend', 'src', 'lib', 'api-v2', 'openapi.json');
+
+// The version is left out so a release bump doesn't change the file.
+export const currentDocument = () => JSON.stringify(buildOpenApi({ version: 'v2' }), null, 2) + '\n';
+
+if (require.main === module) {
+  fs.mkdirSync(path.dirname(OPENAPI_FILE), { recursive: true });
+  fs.writeFileSync(OPENAPI_FILE, currentDocument());
+  console.log(`Wrote ${path.relative(process.cwd(), OPENAPI_FILE)}`);
+  process.exit(0);
+}

backend/src/controllers/paymentController.js

@@ -6,7 +6,6 @@ const { computeDonationRemaining } = require('../utils/donationUtils');
 const { logAdminAction } = require('../utils/adminAudit');
 const { getClientIp } = require('../utils/requestUtils');
 const payments = require('../payments');
-const { createRegistrationCheckout } = require('../payments/checkouts');
 const { emailTickets } = require('./ticketController');
 const { safeErrorMessage } = require('../utils/errorUtils');
 const { assertEventOpen, assertRegistrationEventOpen } = require('../utils/cashupUtils');
@@ -941,54 +940,14 @@ const createCheckout = async (req, res) => {
       throw new Error('Either registrationId or eventId is required');
     }
 
-    // A registration's balance
+    // A registration's balance (shared with POST /api/v2/registrations/:id/checkout)
     if (registrationId) {
-      const reg = await prisma.registration.findUnique({ where: { id: registrationId }, select: { userId: true, eventId: true, event: { select: { endDate: true } } } });
-      if (!reg) { res.status(404); throw new Error('Registration not found'); }
-      if (reg.userId !== userId && req.user.role !== 'admin' && req.user.role !== 'supervisor') {
-        res.status(403); throw new Error('Not authorized to create checkout for this registration');
-      }
-      // If event is in the past, block self-service payment (mirrors the registration-edit block)
-      if (req.user.role !== 'admin' && req.user.role !== 'supervisor' && reg.event?.endDate && new Date(reg.event.endDate).getTime() < Date.now()) {
-        res.status(400); throw new Error('This event has already ended; payment can no longer be made for this registration');
-      }
-      await assertEventOpen(reg.eventId, res);
-
-      // Refresh early-bird pricing — updates priceSnapshot if any tier has expired or sold out.
-      // Must run before the balance is worked out so the checkout charges the right price.
-      const { changed: priceChanged } = await refreshPricingForRegistration(registrationId);
-      if (priceChanged) {
-        const freshReg = await prisma.registration.findUnique({
-          where: { id: registrationId },
-          include: {
-            registrationOptions: { include: { eventOption: { include: { earlyBirdTiers: true } }, tranches: true } },
-            payments: true
-          }
-        });
-        const newTotal = computeRegistrationTotalDue(freshReg, new Date());
-        const totalPaid = (freshReg.payments || []).reduce((s, p) => s + p.amount, 0);
-        return res.status(200).json({
-          priceUpdated: true,
-          newTotal: Math.max(0, newTotal - totalPaid),
-          message: 'One or more early-bird prices have changed since your registration was created. Please review the updated total before proceeding.'
-        });
-      }
-
-      // Part of the balance (supervisor payments page)
-      if (amount && !isNaN(parseFloat(amount))) {
-        const result = await createRegistrationCheckout(registrationId, userId, { successUrl, cancelUrl, failureUrl, amount: parseFloat(amount), provider });
-        return res.status(200).json(result);
-      }
-
-      // Optional donation added at registration ("Donation amount" on the register form)
-      let donation = 0;
-      if (donationAmount !== undefined && donationAmount !== null && donationAmount !== '') {
-        donation = Math.round(parseFloat(donationAmount) * 100) / 100;
-        if (!(donation >= 0) || donation > 100000) { res.status(400); throw new Error('Invalid donation amount'); }
-        if (donation > 0 && donation < payments.MIN_ONLINE_AMOUNT) { res.status(400); throw new Error(`Minimum donation is R${payments.MIN_ONLINE_AMOUNT}`); }
-      }
-
-      const result = await createRegistrationCheckout(registrationId, userId, { successUrl, cancelUrl, failureUrl, donationAmount: donation, provider });
+      const { startRegistrationCheckout } = require('../services/payments');
+      const result = await startRegistrationCheckout(registrationId, req.user, {
+        amount: amount && !isNaN(parseFloat(amount)) ? parseFloat(amount) : null,
+        donationAmount: donationAmount === undefined || donationAmount === null || donationAmount === '' ? null : parseFloat(donationAmount),
+        successUrl, cancelUrl, failureUrl, provider,
+      });
       return res.status(200).json(result);
     }
 

backend/src/controllers/registrationController.js

@@ -3,534 +3,33 @@ const { v4: uuidv4 } = require('uuid');
 const { generateTicketsForRegistration } = require('../utils/ticketUtils');
 const { emailTickets } = require('./ticketController');
 const { hashPassword } = require('../config/auth');
-const { resolveOptionPrice, resolveVariantTierPrice, computeRegistrationTotalDue, refreshPricingForRegistration, attachComputedTotals, attachComputedTotalsToList } = require('../utils/pricing');
+const { computeRegistrationTotalDue, refreshPricingForRegistration, attachComputedTotals, attachComputedTotalsToList } = require('../utils/pricing');
 const { assertEventOpen } = require('../utils/cashupUtils');
 const { logAdminAction } = require('../utils/adminAudit');
 const { getClientIp } = require('../utils/requestUtils');
-const { buildCouponLines, previewCoupon, applyCouponToRegistration, recalculateRegistrationDiscount, releaseRegistrationCoupons, describeCoupon } = require('../utils/coupons');
-const { lineKey, validateAttendees, createAttendees, namedPlacesByKey } = require('../utils/attendees');
+const { previewCoupon, applyCouponToRegistration, recalculateRegistrationDiscount, releaseRegistrationCoupons, describeCoupon } = require('../utils/coupons');
+const { validateAttendees, createAttendees, namedPlacesByKey } = require('../utils/attendees');
 const { findAccountByContact } = require('../utils/accountMatch');
-const { ensureConsentRequests } = require('../utils/consent');
-const { takenCount } = require('../utils/stock');
-const { findOfferByToken, queueWaitlist } = require('../utils/waitlist');
+const { queueWaitlist } = require('../utils/waitlist');
 const { reservedOptionIds } = require('../utils/volunteers');
 
-// Youth events: send parental consent requests for any new under-18 attendees. Runs in
-// the background so a slow mail/WhatsApp send never holds up the registration.
-function queueConsentRequests(registrationId) {
-  ensureConsentRequests(registrationId).catch(e => console.error('[consent] Failed to send requests:', e?.message || e));
-}
-
-// Named attendees for API responses, with whether their ticket has been issued/used.
-const ATTENDEES_INCLUDE = {
-  orderBy: { order: 'asc' },
-  include: {
-    ticket: { select: { id: true, isUsed: true } },
-    // Latest consent request (youth events) — it decides check-in.
-    consentRequests: { orderBy: { createdAt: 'desc' }, take: 1, select: { id: true, status: true, respondedAt: true, lastSentAt: true, textVersion: true } },
-  },
-};
-
-const TICKET_DELIVERY = ['payer', 'each'];
-
-/**
- * Places each line will have once `requested` is added to `existingLines` — used to
- * check attendee names against what's actually being bought.
- */
-function placesAfter(existingLines, requested) {
-  const out = {};
-  // Picked-session lines take no attendee names.
-  for (const l of [...(existingLines || []), ...(requested || [])].filter(x => !x.sessionId)) {
-    const k = lineKey(l.eventOptionId, l.variantId);
-    out[k] = (out[k] || 0) + Number(l.quantity || 0);
-  }
-  return out;
-}
-
-// Active coupon on a registration, for API responses (the discount itself is
-// Registration.discountTotal).
-const ACTIVE_COUPONS_INCLUDE = {
-  where: { releasedAt: null },
-  select: { id: true, discountAmount: true, createdAt: true, coupon: { select: { id: true, code: true, type: true, value: true, description: true } } },
-};
+// Shared with POST /api/v2/registrations: the registration service (TypeScript, 1.51.1).
+const registrationService = require('../services/registrations');
+const {
+  queueConsentRequests, ATTENDEES_INCLUDE, TICKET_DELIVERY, placesAfter, ACTIVE_COUPONS_INCLUDE,
+  pendingCouponLines, priceRequestedOption, checkOptionStock, checkVariantStock, isStaffRole,
+} = registrationService;
 const { BUNDLE_APPS_INCLUDE } = require('../utils/bundles');
-const { registrationClosesAt, wholeCourseClosesAt, expandPickLines, assertSessionCapacity, isPickOption, mergeSessionIds } = require('../utils/sessions');
-
-/**
- * Coupon lines for options that haven't been saved yet, so a code can be checked
- * before anything is created. Mirrors buildCouponLines for one tranche per option.
- */
-function pendingCouponLines(event, resolvedOptions) {
-  return buildCouponLines({
-    registrationOptions: resolvedOptions.map(o => ({
-      eventOptionId: o.eventOptionId,
-      variantId: o.variantId || null,
-      quantity: o.quantity,
-      eventOption: event.eventOptions.find(eo => eo.id === o.eventOptionId),
-      tranches: [{ quantity: o.quantity, priceSnapshot: o.priceSnapshot, appliedTierId: o.appliedTierId }],
-    })),
-  });
-}
-
-/**
- * Price one requested option for this buyer: early-bird tiers, then variant/option price,
- * then the staff price for Staff and above. Returns { priceSnapshot, appliedTierId }.
- */
-async function priceRequestedOption(eventOption, variantId, qty, buyer) {
-  try {
-    const resolved = variantId
-      ? await resolveVariantTierPrice(eventOption, variantId, qty, buyer)
-      : await resolveOptionPrice(eventOption, qty, buyer);
-    return { priceSnapshot: resolved.price, appliedTierId: resolved.tierId };
-  } catch (e) {
-    const variant = variantId ? (eventOption.variants || []).find(v => v.id === variantId) : null;
-    const price = variant && variant.price !== null && variant.price !== undefined ? variant.price : eventOption.price;
-    return { priceSnapshot: Number(price || 0), appliedTierId: null };
-  }
-}
-
-/**
- * Check overall stock availability for an EventOption. Places held for live waitlist
- * offers count as taken, except the offer being claimed (`excludeEntryId`).
- * Returns { available: boolean, remaining: number|null }
- */
-async function checkOptionStock(option, requestedQty, excludeEntryId = null, sessionId = null) {
-  if (!option.stockLimit || option.stockLimit === 0) return { available: true, remaining: null };
-  const remaining = option.stockLimit - await takenCount({ eventOptionId: option.id, sessionId }, { excludeEntryId });
-  return { available: remaining >= requestedQty, remaining };
-}
-
-/**
- * Check stock availability for a specific variant (same rules as checkOptionStock).
- */
-async function checkVariantStock(variant, requestedQty, excludeEntryId = null, sessionId = null) {
-  if (!variant.stockLimit || variant.stockLimit === 0) return { available: true, remaining: null };
-  const remaining = variant.stockLimit - await takenCount({ eventOptionId: variant.eventOptionId, variantId: variant.id, sessionId }, { excludeEntryId });
-  return { available: remaining >= requestedQty, remaining };
-}
+const { expandPickLines, assertSessionCapacity, isPickOption, mergeSessionIds } = require('../utils/sessions');
 
 // @desc    Create a new registration
 // @route   POST /api/registrations
 // @access  Private
 const createRegistration = async (req, res) => {
   try {
-    const { eventId, options, guestName, guestEmail, guestPhone, couponCode, attendees, ticketDelivery, waitlistToken, analyticsSessionId } = req.body;
-
-    // Check if event exists
-    const canIncludeVariants = !!(prisma && prisma.optionVariant && typeof prisma.optionVariant.findMany === 'function');
-    const canIncludeTiers = !!(prisma && prisma.earlyBirdTier && typeof prisma.earlyBirdTier.findMany === 'function');
-    const optionInclude = canIncludeTiers
-      ? { earlyBirdTiers: true, ...(canIncludeVariants ? { variants: true } : {}) }
-      : true;
-    const event = await prisma.event.findUnique({
-      where: { id: eventId },
-      include: { eventOptions: optionInclude ? { include: optionInclude } : true, sessions: true }
-    });
-
-    if (!event) {
-      res.status(404);
-      throw new Error('Event not found');
-    }
-
-    if (!event.isActive) {
-      res.status(400);
-      throw new Error('Event is not active');
-    }
-
-    if (event.cashupStatus === 'closed') {
-      res.status(400);
-      throw new Error('This event is closed and no longer accepting registrations.');
-    }
-
-    // A waitlist claim link: its token identifies the person and releases the places
-    // held for them. It works without logging in, the same way a consent link does.
-    let waitlistOffer = null;
-    if (waitlistToken) {
-      waitlistOffer = await findOfferByToken(waitlistToken);
-      if (!waitlistOffer || waitlistOffer.eventId !== eventId) { res.status(400); throw new Error('This waitlist link is not valid.'); }
-      if (waitlistOffer.status !== 'offered') { res.status(400); throw new Error(`This waitlist offer has ${waitlistOffer.status === 'claimed' ? 'already been used' : 'expired'}.`); }
-      if (new Date(waitlistOffer.offerExpiresAt) < new Date()) { res.status(400); throw new Error('This waitlist offer has expired.'); }
-      if (req.user && req.user.id !== waitlistOffer.userId) { res.status(403); throw new Error('This waitlist offer belongs to someone else.'); }
-    }
-
-    // Enforce auth unless event explicitly opts out
-    const eventRequiresAuth = event.requiresAuth !== false;
-    if (eventRequiresAuth && !req.user && !waitlistOffer) {
-      res.status(401);
-      throw new Error('Authentication required for this event');
-    }
-
-    // Unauthenticated guest registration is only permitted for free events
-    if (!req.user && !waitlistOffer) {
-      const totalDueCheck = (event.eventOptions || []).reduce((sum, eo) => sum + (eo.price || 0), 0);
-      // Also check against the requested options specifically
-      const requestedTotal = (options || []).reduce((sum, opt) => {
-        const eo = event.eventOptions.find(o => o.id === opt.eventOptionId);
-        return sum + ((eo?.price || 0) * (opt.quantity || 1));
-      }, 0);
-      if (requestedTotal > 0) {
-        res.status(400);
-        throw new Error('Guest registration is only available for free events. Please create an account to pay for tickets.');
-      }
-    }
-
-    // Resolve userId — authenticated or guest
-    let userId;
-    if (req.user) {
-      userId = req.user.id;
-    } else if (waitlistOffer) {
-      userId = waitlistOffer.userId;
-    } else {
-      // Guest registration: find existing user by email or create inactive placeholder
-      if (!guestEmail || !guestName) {
-        res.status(400);
-        throw new Error('Name and email are required for unauthenticated registration');
-      }
-      const match = await findAccountByContact({ email: guestEmail, phone: guestPhone });
-      if (match.conflict) {
-        res.status(409);
-        throw new Error('This email and phone number belong to two different accounts. Please log in, or check your details.');
-      }
-      const existingGuest = match.user;
-      if (existingGuest) {
-        userId = existingGuest.id;
-      } else {
-        const newGuest = await prisma.user.create({
-          data: {
-            id: uuidv4(),
-            name: guestName,
-            email: guestEmail,
-            password: '',
-            phoneNumber: guestPhone || null,
-            isActive: false,
-            updatedAt: new Date(),
-          }
-        });
-        userId = newGuest.id;
-      }
-    }
-
-    // Enforce registration cutoff for public registrations (multi-day events close when
-    // the first session starts, or later with late joining — see utils/sessions.js).
-    const now = new Date();
-    if (now >= registrationClosesAt(event, event.sessions)) {
-      res.status(400);
-      throw new Error('Registration is closed for this event');
-    }
-
-    // Validate options
-    if (!options || !Array.isArray(options) || options.length === 0) {
-      res.status(400);
-      throw new Error('At least one option must be selected');
-    }
-
-    // "Pick sessions" options become one line per chosen session; whole-course tickets
-    // on such an event still close when the whole course does.
-    const lines = expandPickLines(event, options, { now });
-    // (An all-sessions ticket with sessions ticked is checked per session instead.)
-    if (event.attendanceMode === 'pick' && lines.some(l => !l.sessionId && !l.sessionIds?.length) && now >= wholeCourseClosesAt(event, event.sessions)) {
-      res.status(400);
-      throw new Error('Whole-course tickets are no longer on sale — choose the sessions you want instead.');
-    }
-    await assertSessionCapacity(event, lines, undefined, { excludeEntryId: waitlistOffer?.id });
-
-    // Validate each option and resolve prices / check stock.
-    // Options are independent of each other, so resolve them concurrently. Errors are marked
-    // with `.isStockError` rather than relying on shared `res.statusCode` (which would race
-    // across concurrent iterations) — the outer catch always responds 400 regardless.
-    // The kids check-in and volunteer tickets are handed out by staff, never sold.
-    const reserved = new Set(isStaffRole(req.user?.role) ? [] : reservedOptionIds(event));
-    const resolvedOptions = await Promise.all(lines.map(async (option) => {
-      const eventOption = event.eventOptions.find(eo => eo.id === option.eventOptionId);
-      if (!eventOption || reserved.has(eventOption.id)) {
-        throw new Error(`Option with ID ${option.eventOptionId} not found for this event`);
-      }
-      if (!option.quantity || option.quantity < 1) {
-        throw new Error('Quantity must be at least 1');
-      }
-
-      const qty = option.quantity;
-
-      // Check overall option stock
-      try {
-        const stockCheck = await checkOptionStock(eventOption, qty, waitlistOffer?.id, option.sessionId);
-        if (!stockCheck.available) {
-          const err = new Error(`"${eventOption.name}" is sold out or does not have enough stock (${stockCheck.remaining ?? 0} remaining).`);
-          err.isStockError = true;
-          throw err;
-        }
-      } catch (e) {
-        if (e.isStockError) throw e; // propagate stock errors
-        // If stock check function fails (pre-migration), continue without stock check
-      }
-
-      // Check variant stock (if a variant is selected)
-      let variantId = option.variantId || null;
-      let variantPrice = null;
-      if (variantId && canIncludeVariants) {
-        const variant = (eventOption.variants || []).find(v => v.id === variantId);
-        if (!variant) {
-          throw new Error(`Variant not found for option "${eventOption.name}"`);
-        }
-        try {
-          const vStock = await checkVariantStock(variant, qty, waitlistOffer?.id, option.sessionId);
-          if (!vStock.available) {
-            const err = new Error(`Variant "${variant.name}" is sold out (${vStock.remaining ?? 0} remaining).`);
-            err.isStockError = true;
-            throw err;
-          }
-        } catch (e) {
-          if (e.isStockError) throw e;
-        }
-        variantPrice = variant.price; // null = use option price
-      }
-
-      // Resolve price: variant-level tiers take priority, then option-level tiers, then
-      // base prices, then the staff price for Staff and above.
-      let priceSnapshot = null;
-      let appliedTierId = null;
-      if (canIncludeTiers) {
-        const buyer = req.user || (waitlistOffer ? await prisma.user.findUnique({ where: { id: waitlistOffer.userId }, select: { id: true, role: true } }) : null);
-        ({ priceSnapshot, appliedTierId } = await priceRequestedOption(eventOption, variantId, qty, buyer));
-      } else {
-        priceSnapshot = variantPrice !== null && variantPrice !== undefined ? variantPrice : null;
-      }
-      if (priceSnapshot === null) priceSnapshot = eventOption.price;
-
-      return { ...option, variantId, appliedTierId, priceSnapshot };
-    }));
-
-    // Check a coupon code before anything is saved, so a bad code doesn't leave a
-    // half-made registration behind. It's applied (and re-checked under a lock) below.
-    if (couponCode) {
-      const buyer = req.user ? { id: req.user.id, role: req.user.role, email: req.user.email } : null;
-      await previewCoupon({ code: couponCode, eventId, user: buyer, lines: pendingCouponLines(event, resolvedOptions) });
-    }
-
-    // Check for existing non-cancelled registration for this user+event → merge instead
-    const existingReg = await prisma.registration.findFirst({
-      where: { userId, eventId, status: { not: 'cancelled' } },
-      include: { registrationOptions: true }
-    });
-
-    // Attendee names are checked against the places the registration will have after
-    // this purchase, counting names already given on an existing registration.
-    const cleanAttendees = validateAttendees(
-      event,
-      placesAfter(existingReg?.registrationOptions, resolvedOptions),
-      attendees,
-      existingReg ? await namedPlacesByKey(existingReg.id) : {}
-    );
-    if (ticketDelivery !== undefined && !TICKET_DELIVERY.includes(ticketDelivery)) {
-      res.status(400);
-      throw new Error("ticketDelivery must be 'payer' or 'each'");
-    }
-
-    let registration;
-    let isNewRegistration = false;
-    if (existingReg) {
-      // Merge: add a new price tranche per requested option into the existing registration.
-      // Never overwrite an existing row's priceSnapshot/quantity in place — that would blend
-      // tickets bought at different early-bird prices into a single (wrong) price. Each
-      // purchase gets its own tranche; the RegistrationOption row stays a maintained aggregate.
-      for (const opt of resolvedOptions) {
-        // Match on eventOptionId + variantId (+ session, for picked sessions) for correct row
-        const existing = existingReg.registrationOptions.find(
-          ro => ro.eventOptionId === opt.eventOptionId && (ro.variantId || null) === (opt.variantId || null) && (ro.sessionId || null) === (opt.sessionId || null)
-        );
-        if (existing) {
-          await prisma.$transaction([
-            prisma.registrationOptionTranche.create({
-              data: {
-                id: uuidv4(),
-                registrationOptionId: existing.id,
-                quantity: opt.quantity,
-                priceSnapshot: opt.priceSnapshot,
-                appliedTierId: opt.appliedTierId || null,
-              }
-            }),
-            prisma.registrationOption.update({
-              where: { id: existing.id },
-              data: { quantity: existing.quantity + opt.quantity, priceSnapshot: opt.priceSnapshot, appliedTierId: opt.appliedTierId || null, ...(existing.sessionId ? {} : { sessionIds: mergeSessionIds(existing.sessionIds, opt.sessionIds) }) }
-            })
-          ]);
-        } else {
-          await prisma.registrationOption.create({
-            data: {
-              id: uuidv4(),
-              registrationId: existingReg.id,
-              eventOptionId: opt.eventOptionId,
-              quantity: opt.quantity,
-              variantId: opt.variantId || null,
-              sessionId: opt.sessionId || null,
-              sessionIds: opt.sessionIds || [],
-              appliedTierId: opt.appliedTierId || null,
-              priceSnapshot: opt.priceSnapshot,
-              tranches: {
-                create: [{
-                  id: uuidv4(),
-                  quantity: opt.quantity,
-                  priceSnapshot: opt.priceSnapshot,
-                  appliedTierId: opt.appliedTierId || null,
-                }]
-              }
-            }
-          });
-        }
-      }
-      // Only downgrade from paid if the newly added items actually cost something
-      const newItemsCost = resolvedOptions.reduce((sum, opt) => {
-        return sum + ((opt.priceSnapshot || 0) * (opt.quantity || 0));
-      }, 0);
-      if (existingReg.status === 'paid' && newItemsCost > 0) {
-        await prisma.registration.update({ where: { id: existingReg.id }, data: { status: 'partial_paid', updatedAt: new Date() } });
-      } else {
-        await prisma.registration.update({ where: { id: existingReg.id }, data: { updatedAt: new Date() } });
-      }
-      registration = await prisma.registration.findUnique({
-        where: { id: existingReg.id },
-        include: {
-          registrationOptions: { include: { eventOption: true, tranches: true } },
-          event: true,
-          user: { select: { id: true, name: true, email: true, phoneNumber: true } }
-        }
-      });
-    } else {
-      isNewRegistration = true;
-      // Create new registration
-      const registrationId = uuidv4();
-      registration = await prisma.registration.create({
-        data: {
-          id: registrationId,
-          userId,
-          eventId,
-          updatedAt: new Date(),
-          registrationOptions: {
-            create: resolvedOptions.map(option => ({
-              id: uuidv4(),
-              eventOptionId: option.eventOptionId,
-              quantity: option.quantity,
-              variantId: option.variantId || null,
-              sessionId: option.sessionId || null,
-              sessionIds: option.sessionIds || [],
-              appliedTierId: option.appliedTierId || null,
-              priceSnapshot: option.priceSnapshot,
-              tranches: {
-                create: [{
-                  id: uuidv4(),
-                  quantity: option.quantity,
-                  priceSnapshot: option.priceSnapshot,
-                  appliedTierId: option.appliedTierId || null,
-                }]
-              }
-            }))
-          }
-        },
-        include: {
-          registrationOptions: { include: { eventOption: true, tranches: true } },
-          event: true,
-          user: { select: { id: true, name: true, email: true, phoneNumber: true } }
-        }
-      });
-    }
-
-    if (cleanAttendees.length > 0) {
-      await createAttendees(registration.id, cleanAttendees);
-      queueConsentRequests(registration.id);
-    }
-    if (waitlistOffer) {
-      await prisma.waitlistEntry.update({
-        where: { id: waitlistOffer.id },
-        data: { status: 'claimed', claimedAt: new Date(), registrationId: registration.id, offerTokenHash: null },
-      });
-    }
-    if (ticketDelivery) {
-      await prisma.registration.update({ where: { id: registration.id }, data: { ticketDelivery } });
-    }
-
-    // Bundle deals, then the coupon (or re-work an existing one over the merged items).
-    let couponError = null;
-    const hasDiscount = (await recalculateRegistrationDiscount(registration.id)) > 0;
-    if (couponCode) {
-      try {
-        await applyCouponToRegistration({ registrationId: registration.id, code: couponCode });
-      } catch (e) {
-        // Lost a race for the last use since the check above — keep the registration.
-        if (!e.isCouponError) throw e;
-        couponError = e.message;
-      }
-    }
-    if (couponCode || hasDiscount || !isNewRegistration || cleanAttendees.length > 0 || ticketDelivery) {
-      registration = await prisma.registration.findUnique({
-        where: { id: registration.id },
-        include: {
-          registrationOptions: { include: { eventOption: true, tranches: true } },
-          event: true,
-          user: { select: { id: true, name: true, email: true, phoneNumber: true } },
-          couponRedemptions: ACTIVE_COUPONS_INCLUDE,
-
-          bundleApplications: BUNDLE_APPS_INCLUDE,
-          attendees: ATTENDEES_INCLUDE,
-        }
-      });
-    }
-
-    // If total due is zero, mark as paid and generate/update tickets if no required form
-    let freeTicketMockReq = null, freeTicketMockRes = null;
-    try {
-      const totalDue = computeRegistrationTotalDue(registration, new Date());
-      if (totalDue === 0) {
-        // Mark paid (no-op if already paid)
-        if (registration.status !== 'paid') {
-          await prisma.registration.update({ where: { id: registration.id }, data: { status: 'paid', updatedAt: new Date() } });
-        }
-        // check if event has a required form
-        let hasRequiredForm = false;
-        try {
-          const form = await prisma.eventForm.findUnique({ where: { eventId: registration.eventId } });
-          hasRequiredForm = !!(form && form.isRequired);
-        } catch {}
-        if (!hasRequiredForm) {
-          // Same generator as paid registrations: a ticket per named attendee, and one
-          // shared quantity ticket for the rest of each line.
-          await generateTicketsForRegistration(registration.id);
-          // Capture for chained email — tickets sent after registration confirmation
-          freeTicketMockReq = { user: { id: registration.userId }, body: { registrationId: registration.id } };
-          freeTicketMockRes = { status: () => freeTicketMockRes, json: () => {} };
-        }
-
-        // reflect status change in the returned object
-        registration.status = 'paid';
-      }
-    } catch (e) {
-      // ignore errors in auto-generation path; manual generation remains available
-    }
-
-    // Fire-and-forget: registration email first, then tickets (guarantees order)
-    const { sendRegistrationEmails, sendRegistrationUpdatedEmails } = require('../utils/notifications');
-    const _regId = registration.id;
-    const _freeTicketReq = freeTicketMockReq;
-    const _freeTicketRes = freeTicketMockRes;
-    (async () => {
-      try {
-        if (isNewRegistration) {
-          await sendRegistrationEmails(_regId);
-        } else {
-          await sendRegistrationUpdatedEmails(_regId);
-        }
-      } catch (e) { console.error('Failed to send registration emails:', e); }
-      if (_freeTicketReq) {
-        try { await emailTickets(_freeTicketReq, _freeTicketRes); } catch (e) { console.error('Error emailing tickets for free registration:', e); }
-      }
-    })();
-
-    // Funnel: this registration came from a tracked (cookie-consented) visit.
-    if (analyticsSessionId) {
-      const { recordSubmit } = require('../utils/analytics');
-      recordSubmit(registration, analyticsSessionId).catch(e => console.warn('[analytics] submit not recorded:', e?.message || e));
-    }
-
-    res.status(201).json({ ...attachComputedTotals(registration), ...(couponError ? { couponError } : {}) });
+    const actor = req.user ? { id: req.user.id, role: req.user.role, email: req.user.email } : null;
+    const { registration, couponError } = await registrationService.createRegistration(req.body || {}, actor);
+    res.status(201).json({ ...registration, ...(couponError ? { couponError } : {}) });
   } catch (error) {
     res.status(400).json({ message: error.message });
   }
@@ -827,71 +326,7 @@ const updateRegistrationStatus = async (req, res) => {
 // @access  Private
 const cancelRegistration = async (req, res) => {
   try {
-    const registration = await prisma.registration.findUnique({
-      where: { id: req.params.id },
-      include: { event: { select: { endDate: true } } }
-    });
-
-    if (!registration) {
-      res.status(404);
-      throw new Error('Registration not found');
-    }
-
-    // Check if user is authorized to cancel this registration
-    if (registration.userId !== req.user.id && req.user.role !== 'admin') {
-      res.status(403);
-      throw new Error('Not authorized to cancel this registration');
-    }
-
-    // If event is in the past, block self-cancellation (mirrors the edit-block above)
-    if (req.user.role !== 'admin' && registration.event?.endDate && new Date(registration.event.endDate).getTime() < Date.now()) {
-      res.status(400);
-      throw new Error('This event has already ended; registration can no longer be cancelled');
-    }
-
-    await assertEventOpen(registration.eventId, res);
-
-    // Check if registration can be cancelled
-    if (registration.status === 'cancelled') {
-      res.status(400);
-      throw new Error('Registration is already cancelled');
-    }
-
-    // Non-admins cannot cancel a registration that has payments against it
-    if (req.user.role !== 'admin') {
-      const paymentCount = await prisma.payment.count({
-        where: { registrationId: registration.id, amount: { gt: 0 } }
-      });
-      if (paymentCount > 0) {
-        res.status(403);
-        throw new Error('This registration has payments recorded against it and cannot be self-cancelled. Please contact the organisation for assistance.');
-      }
-    }
-
-    const updatedRegistration = await prisma.registration.update({
-      where: { id: req.params.id },
-      data: {
-        status: 'cancelled',
-        updatedAt: new Date()
-      }
-    });
-    await releaseRegistrationCoupons(req.params.id);
-    queueWaitlist(registration.eventId);
-
-    // Only log when staff cancels on someone else's behalf — a routine self-service
-    // cancellation isn't an admin action worth cluttering the audit trail with.
-    if (registration.userId !== req.user.id) {
-      logAdminAction({
-        actorId: req.user.id,
-        actorRole: req.user.role,
-        action: 'registration_cancelled',
-        targetType: 'Registration',
-        targetId: req.params.id,
-        metadata: { registrationOwnerId: registration.userId },
-        ip: getClientIp(req),
-      });
-    }
-
+    const updatedRegistration = await registrationService.cancelRegistration(req.params.id, req.user, getClientIp(req));
     res.json({ message: 'Registration cancelled', registration: updatedRegistration });
   } catch (error) {
     res.status(400).json({ message: error.message });
@@ -2153,7 +1588,6 @@ async function syncStatusAfterDiscount(registrationId) {
   return status;
 }
 
-const isStaffRole = (role) => ['admin', 'supervisor', 'staff'].includes(role);
 
 // @desc    Apply a coupon code to an existing registration
 // @route   POST /api/registrations/:id/coupon

backend/src/services/errors.ts

@@ -0,0 +1,19 @@
+/**
+ * An error from a service (src/services/*) with the HTTP status it means. v2 turns it into its
+ * error shape by the status (v2/errors.ts); v1 controllers keep answering as they always did.
+ */
+export class ServiceError extends Error {
+  readonly statusCode: number;
+  /** Extra, e.g. couponError or a code the caller can switch on. */
+  readonly code?: string;
+
+  constructor(statusCode: number, message: string, code?: string) {
+    super(message);
+    this.statusCode = statusCode;
+    this.code = code;
+  }
+}
+
+export const fail = (statusCode: number, message: string, code?: string): never => {
+  throw new ServiceError(statusCode, message, code);
+};

backend/src/services/payments.ts

@@ -0,0 +1,88 @@
+/**
+ * Paying a registration online (1.51.1). Moved from paymentController.createCheckout so
+ * POST /api/payments/checkout (v1) and POST /api/v2/registrations/:id/checkout share it.
+ */
+import { prisma } from '../v2/legacy';
+import { fail, ServiceError } from './errors';
+import type { Role } from './registrations';
+
+/* eslint-disable @typescript-eslint/no-explicit-any -- the JS helpers below aren't typed yet */
+const payments = require('../payments') as { MIN_ONLINE_AMOUNT: number };
+const { createRegistrationCheckout } = require('../payments/checkouts') as {
+  createRegistrationCheckout(registrationId: string, userId: string, opts: { successUrl?: string; cancelUrl?: string; failureUrl?: string; donationAmount?: number; amount?: number | null; provider?: string | null }): Promise<{
+    checkoutId: string; redirectUrl: string; provider: string; amount: number; registration: { id: string; eventId: string; eventTitle: string };
+  }>;
+};
+const pricing = require('../utils/pricing') as {
+  refreshPricingForRegistration(id: string): Promise<{ changed: boolean }>;
+  computeRegistrationTotalDue(registration: any, at: Date): number;
+};
+const { assertEventOpen } = require('../utils/cashupUtils') as { assertEventOpen(eventId: string): Promise<unknown> };
+
+export type CheckoutOptions = {
+  /** Pay only this much of the balance (staff taking part payments). */
+  amount?: number | null;
+  /** An optional donation added on top (the register form's "Donation amount"). */
+  donationAmount?: number | null;
+  provider?: string | null;
+  successUrl?: string;
+  cancelUrl?: string;
+  failureUrl?: string;
+};
+
+export type CheckoutResult =
+  | { priceUpdated: true; newTotal: number; message: string }
+  | { priceUpdated?: false; checkoutId: string; redirectUrl: string; provider: string; amount: number; registration: { id: string; eventId: string; eventTitle: string } };
+
+/**
+ * Starts an online payment for what's owed on a registration (the owner, or a supervisor or
+ * admin). If an early-bird price ran out since it was made, nothing is charged: the caller is
+ * told the new total to show first.
+ */
+export async function startRegistrationCheckout(registrationId: string, actor: { id: string; role: Role }, opts: CheckoutOptions = {}): Promise<CheckoutResult> {
+  const reg = await prisma.registration.findUnique({ where: { id: registrationId }, select: { userId: true, eventId: true, event: { select: { endDate: true } } } });
+  if (!reg) return fail(404, 'Registration not found');
+  const staffSide = actor.role === 'admin' || actor.role === 'supervisor';
+  if (reg.userId !== actor.id && !staffSide) fail(403, 'Not authorized to create checkout for this registration');
+  // If event is in the past, block self-service payment (mirrors the registration-edit block)
+  if (!staffSide && reg.event?.endDate && new Date(reg.event.endDate).getTime() < Date.now()) {
+    fail(400, 'This event has already ended; payment can no longer be made for this registration');
+  }
+  try {
+    await assertEventOpen(reg.eventId);
+  } catch (e: any) {
+    throw new ServiceError(e.message === 'Event not found' ? 404 : 400, e.message);
+  }
+
+  // Refresh early-bird pricing — updates priceSnapshot if any tier has expired or sold out.
+  // Must run before the balance is worked out so the checkout charges the right price.
+  const { changed } = await pricing.refreshPricingForRegistration(registrationId);
+  if (changed) {
+    const fresh = await prisma.registration.findUniqueOrThrow({
+      where: { id: registrationId },
+      include: { registrationOptions: { include: { eventOption: { include: { earlyBirdTiers: true } }, tranches: true } }, payments: true },
+    });
+    const newTotal = pricing.computeRegistrationTotalDue(fresh, new Date());
+    const totalPaid = fresh.payments.reduce((s, p) => s + p.amount, 0);
+    return {
+      priceUpdated: true,
+      newTotal: Math.max(0, newTotal - totalPaid),
+      message: 'One or more early-bird prices have changed since your registration was created. Please review the updated total before proceeding.',
+    };
+  }
+
+  const urls = { successUrl: opts.successUrl, cancelUrl: opts.cancelUrl, failureUrl: opts.failureUrl, provider: opts.provider ?? null };
+
+  // Part of the balance (supervisor payments page)
+  if (opts.amount !== undefined && opts.amount !== null && !isNaN(Number(opts.amount))) {
+    return createRegistrationCheckout(registrationId, actor.id, { ...urls, amount: Number(opts.amount) });
+  }
+
+  let donation = 0;
+  if (opts.donationAmount !== undefined && opts.donationAmount !== null) {
+    donation = Math.round(Number(opts.donationAmount) * 100) / 100;
+    if (!(donation >= 0) || donation > 100000) fail(400, 'Invalid donation amount');
+    if (donation > 0 && donation < payments.MIN_ONLINE_AMOUNT) fail(400, `Minimum donation is R${payments.MIN_ONLINE_AMOUNT}`);
+  }
+  return createRegistrationCheckout(registrationId, actor.id, { ...urls, donationAmount: donation });
+}

backend/src/services/registrations.ts

@@ -0,0 +1,497 @@
+/**
+ * Making and cancelling registrations (1.51.1). Moved here from registrationController.js so
+ * POST /api/registrations (v1) and POST /api/v2/registrations run the same code. Errors are
+ * ServiceErrors carrying their HTTP status.
+ */
+import { v4 as uuidv4 } from 'uuid';
+import { prisma } from '../v2/legacy';
+import { fail, ServiceError } from './errors';
+
+/* eslint-disable @typescript-eslint/no-explicit-any -- the JS helpers below aren't typed yet */
+const { generateTicketsForRegistration } = require('../utils/ticketUtils') as { generateTicketsForRegistration(id: string): Promise<unknown> };
+const pricing = require('../utils/pricing') as {
+  resolveOptionPrice(option: any, qty: number, buyer: any): Promise<{ price: number; tierId: string | null }>;
+  resolveVariantTierPrice(option: any, variantId: string, qty: number, buyer: any): Promise<{ price: number; tierId: string | null }>;
+  computeRegistrationTotalDue(registration: any, at: Date): number;
+  attachComputedTotals<T>(registration: T): T & { totalDueComputed: number };
+};
+const coupons = require('../utils/coupons') as {
+  buildCouponLines(registration: any): any[];
+  previewCoupon(args: { code: string; eventId: string; user: any; lines: any[] }): Promise<unknown>;
+  applyCouponToRegistration(args: { registrationId: string; code: string }): Promise<unknown>;
+  recalculateRegistrationDiscount(registrationId: string): Promise<number>;
+  releaseRegistrationCoupons(registrationId: string): Promise<unknown>;
+};
+const attendeesUtil = require('../utils/attendees') as {
+  lineKey(eventOptionId: string, variantId?: string | null): string;
+  validateAttendees(event: any, places: Record<string, number>, attendees: unknown, existing: Record<string, number>): any[];
+  createAttendees(registrationId: string, attendees: any[]): Promise<unknown>;
+  namedPlacesByKey(registrationId: string): Promise<Record<string, number>>;
+};
+const { findAccountByContact } = require('../utils/accountMatch') as { findAccountByContact(c: { email?: string; phone?: string }): Promise<{ user: { id: string } | null; conflict?: boolean }> };
+const { ensureConsentRequests } = require('../utils/consent') as { ensureConsentRequests(registrationId: string): Promise<unknown> };
+const { takenCount } = require('../utils/stock') as { takenCount(where: object, opts?: { excludeEntryId?: string | null }): Promise<number> };
+const waitlist = require('../utils/waitlist') as { findOfferByToken(token: string): Promise<any>; queueWaitlist(eventId: string): void };
+const { reservedOptionIds } = require('../utils/volunteers') as { reservedOptionIds(event: any): string[] };
+const { BUNDLE_APPS_INCLUDE } = require('../utils/bundles') as { BUNDLE_APPS_INCLUDE: any };
+const sessions = require('../utils/sessions') as {
+  registrationClosesAt(event: any, sessions: any[]): Date;
+  wholeCourseClosesAt(event: any, sessions: any[]): Date;
+  expandPickLines(event: any, options: any[], opts: { now: Date }): any[];
+  assertSessionCapacity(event: any, lines: any[], registrationId?: string, opts?: { excludeEntryId?: string }): Promise<void>;
+  mergeSessionIds(a: string[] | null | undefined, b: string[] | null | undefined): string[];
+};
+const { assertEventOpen } = require('../utils/cashupUtils') as { assertEventOpen(eventId: string, res?: unknown): Promise<unknown> };
+const { logAdminAction } = require('../utils/adminAudit') as { logAdminAction(entry: object): Promise<void> };
+
+export type Role = 'admin' | 'supervisor' | 'staff' | 'user';
+export type Actor = { id: string; role: Role; email?: string } | null;
+
+export const TICKET_DELIVERY = ['payer', 'each'] as const;
+export const isStaffRole = (role: string | undefined | null): boolean => ['admin', 'supervisor', 'staff'].includes(String(role));
+
+// Named attendees for API responses, with whether their ticket has been issued/used.
+export const ATTENDEES_INCLUDE = {
+  orderBy: { order: 'asc' as const },
+  include: {
+    ticket: { select: { id: true, isUsed: true } },
+    // Latest consent request (youth events) — it decides check-in.
+    consentRequests: { orderBy: { createdAt: 'desc' as const }, take: 1, select: { id: true, status: true, respondedAt: true, lastSentAt: true, textVersion: true } },
+  },
+};
+
+// Active coupon on a registration, for API responses (the discount itself is
+// Registration.discountTotal).
+export const ACTIVE_COUPONS_INCLUDE = {
+  where: { releasedAt: null },
+  select: { id: true, discountAmount: true, createdAt: true, coupon: { select: { id: true, code: true, type: true, value: true, description: true } } },
+};
+
+// Youth events: send parental consent requests for any new under-18 attendees. Runs in
+// the background so a slow mail/WhatsApp send never holds up the registration.
+export function queueConsentRequests(registrationId: string): void {
+  ensureConsentRequests(registrationId).catch((e: any) => console.error('[consent] Failed to send requests:', e?.message || e));
+}
+
+type Line = { eventOptionId: string; variantId?: string | null; sessionId?: string | null; quantity: number | string };
+
+/**
+ * Places each line will have once `requested` is added to `existingLines` — used to
+ * check attendee names against what's actually being bought.
+ */
+export function placesAfter(existingLines: Line[] | undefined, requested: Line[] | undefined): Record<string, number> {
+  const out: Record<string, number> = {};
+  // Picked-session lines take no attendee names.
+  for (const l of [...(existingLines || []), ...(requested || [])].filter(x => !x.sessionId)) {
+    const k = attendeesUtil.lineKey(l.eventOptionId, l.variantId);
+    out[k] = (out[k] || 0) + Number(l.quantity || 0);
+  }
+  return out;
+}
+
+/**
+ * Coupon lines for options that haven't been saved yet, so a code can be checked
+ * before anything is created. Mirrors buildCouponLines for one tranche per option.
+ */
+export function pendingCouponLines(event: { eventOptions: { id: string }[] }, resolvedOptions: any[]): any[] {
+  return coupons.buildCouponLines({
+    registrationOptions: resolvedOptions.map(o => ({
+      eventOptionId: o.eventOptionId,
+      variantId: o.variantId || null,
+      quantity: o.quantity,
+      eventOption: event.eventOptions.find(eo => eo.id === o.eventOptionId),
+      tranches: [{ quantity: o.quantity, priceSnapshot: o.priceSnapshot, appliedTierId: o.appliedTierId }],
+    })),
+  });
+}
+
+/**
+ * Price one requested option for this buyer: early-bird tiers, then variant/option price,
+ * then the staff price for Staff and above. Returns { priceSnapshot, appliedTierId }.
+ */
+export async function priceRequestedOption(eventOption: any, variantId: string | null, qty: number, buyer: any): Promise<{ priceSnapshot: number; appliedTierId: string | null }> {
+  try {
+    const resolved = variantId
+      ? await pricing.resolveVariantTierPrice(eventOption, variantId, qty, buyer)
+      : await pricing.resolveOptionPrice(eventOption, qty, buyer);
+    return { priceSnapshot: resolved.price, appliedTierId: resolved.tierId };
+  } catch {
+    const variant = variantId ? (eventOption.variants || []).find((v: any) => v.id === variantId) : null;
+    const price = variant && variant.price !== null && variant.price !== undefined ? variant.price : eventOption.price;
+    return { priceSnapshot: Number(price || 0), appliedTierId: null };
+  }
+}
+
+/**
+ * Check overall stock availability for an EventOption. Places held for live waitlist
+ * offers count as taken, except the offer being claimed (`excludeEntryId`).
+ */
+export async function checkOptionStock(option: { id: string; stockLimit: number }, requestedQty: number, excludeEntryId: string | null = null, sessionId: string | null = null) {
+  if (!option.stockLimit || option.stockLimit === 0) return { available: true, remaining: null as number | null };
+  const remaining = option.stockLimit - await takenCount({ eventOptionId: option.id, sessionId }, { excludeEntryId });
+  return { available: remaining >= requestedQty, remaining };
+}
+
+/** Check stock availability for a specific variant (same rules as checkOptionStock). */
+export async function checkVariantStock(variant: { id: string; eventOptionId: string; stockLimit: number | null }, requestedQty: number, excludeEntryId: string | null = null, sessionId: string | null = null) {
+  if (!variant.stockLimit || variant.stockLimit === 0) return { available: true, remaining: null as number | null };
+  const remaining = variant.stockLimit - await takenCount({ eventOptionId: variant.eventOptionId, variantId: variant.id, sessionId }, { excludeEntryId });
+  return { available: remaining >= requestedQty, remaining };
+}
+
+export type RequestedOption = { eventOptionId: string; quantity: number; variantId?: string | null; sessionIds?: string[] };
+export type CreateRegistrationInput = {
+  eventId: string;
+  options: RequestedOption[];
+  guestName?: string;
+  guestEmail?: string;
+  guestPhone?: string;
+  couponCode?: string;
+  attendees?: unknown[];
+  ticketDelivery?: string;
+  waitlistToken?: string;
+  analyticsSessionId?: string;
+};
+
+const FULL_INCLUDE = {
+  registrationOptions: { include: { eventOption: true, tranches: true } },
+  event: true,
+  user: { select: { id: true, name: true, email: true, phoneNumber: true } },
+} as const;
+
+/**
+ * Registers someone for an event (online, a guest for a free event, or with a waitlist link):
+ * checks the event is open, prices each line (early-bird, variant, staff price), checks stock
+ * and session places, adds to an existing registration for the same person and event, applies
+ * bundle deals and a coupon, and issues tickets straight away when nothing is owed.
+ */
+export async function createRegistration(input: CreateRegistrationInput, actor: Actor) {
+  try {
+    return await create(input, actor);
+  } catch (e: any) {
+    // The helpers (coupons, attendee names, session places…) throw plain Errors written for
+    // people; like v1, those are the caller's problem (400) unless they carry a status.
+    if (e instanceof ServiceError || /^P\d{4}$/.test(String(e?.code || ''))) throw e;
+    throw new ServiceError(e?.statusCode || 400, e?.message || 'Registration failed');
+  }
+}
+
+async function create(input: CreateRegistrationInput, actor: Actor) {
+  const { eventId, options, guestName, guestEmail, guestPhone, couponCode, attendees, ticketDelivery, waitlistToken, analyticsSessionId } = input;
+
+  const event = await prisma.event.findUnique({
+    where: { id: eventId },
+    include: { eventOptions: { include: { earlyBirdTiers: true, variants: true } }, sessions: true },
+  });
+  if (!event) return fail(404, 'Event not found');
+  if (!event.isActive) return fail(400, 'Event is not active');
+  if (event.cashupStatus === 'closed') return fail(400, 'This event is closed and no longer accepting registrations.');
+
+  // A waitlist claim link: its token identifies the person and releases the places
+  // held for them. It works without logging in, the same way a consent link does.
+  let waitlistOffer: any = null;
+  if (waitlistToken) {
+    waitlistOffer = await waitlist.findOfferByToken(waitlistToken);
+    if (!waitlistOffer || waitlistOffer.eventId !== eventId) fail(400, 'This waitlist link is not valid.');
+    if (waitlistOffer.status !== 'offered') fail(400, `This waitlist offer has ${waitlistOffer.status === 'claimed' ? 'already been used' : 'expired'}.`);
+    if (new Date(waitlistOffer.offerExpiresAt) < new Date()) fail(400, 'This waitlist offer has expired.');
+    if (actor && actor.id !== waitlistOffer.userId) fail(403, 'This waitlist offer belongs to someone else.');
+  }
+
+  // Enforce auth unless event explicitly opts out
+  if (event.requiresAuth !== false && !actor && !waitlistOffer) fail(401, 'Authentication required for this event');
+
+  // Unauthenticated guest registration is only permitted for free events
+  if (!actor && !waitlistOffer) {
+    const requestedTotal = (options || []).reduce((sum, opt) => {
+      const eo = event.eventOptions.find(o => o.id === opt.eventOptionId);
+      return sum + ((eo?.price || 0) * (opt.quantity || 1));
+    }, 0);
+    if (requestedTotal > 0) fail(400, 'Guest registration is only available for free events. Please create an account to pay for tickets.');
+  }
+
+  // Resolve userId — authenticated or guest
+  let userId: string;
+  if (actor) {
+    userId = actor.id;
+  } else if (waitlistOffer) {
+    userId = waitlistOffer.userId;
+  } else {
+    // Guest registration: find existing user by email or create inactive placeholder
+    if (!guestEmail || !guestName) return fail(400, 'Name and email are required for unauthenticated registration');
+    const match = await findAccountByContact({ email: guestEmail, phone: guestPhone });
+    if (match.conflict) fail(409, 'This email and phone number belong to two different accounts. Please log in, or check your details.');
+    if (match.user) {
+      userId = match.user.id;
+    } else {
+      const newGuest = await prisma.user.create({
+        data: { id: uuidv4(), name: guestName, email: guestEmail, password: '', phoneNumber: guestPhone || null, isActive: false, updatedAt: new Date() },
+      });
+      userId = newGuest.id;
+    }
+  }
+
+  // Enforce registration cutoff for public registrations (multi-day events close when
+  // the first session starts, or later with late joining — see utils/sessions.js).
+  const now = new Date();
+  if (now >= sessions.registrationClosesAt(event, event.sessions)) fail(400, 'Registration is closed for this event');
+
+  if (!options || !Array.isArray(options) || options.length === 0) fail(400, 'At least one option must be selected');
+
+  // "Pick sessions" options become one line per chosen session; whole-course tickets
+  // on such an event still close when the whole course does.
+  const lines = sessions.expandPickLines(event, options, { now });
+  // (An all-sessions ticket with sessions ticked is checked per session instead.)
+  if (event.attendanceMode === 'pick' && lines.some(l => !l.sessionId && !l.sessionIds?.length) && now >= sessions.wholeCourseClosesAt(event, event.sessions)) {
+    fail(400, 'Whole-course tickets are no longer on sale — choose the sessions you want instead.');
+  }
+  await sessions.assertSessionCapacity(event, lines, undefined, { excludeEntryId: waitlistOffer?.id });
+
+  // Validate each option and resolve prices / check stock. Options are independent of each
+  // other, so resolve them concurrently. The kids check-in and volunteer tickets are handed
+  // out by staff, never sold.
+  const reserved = new Set(isStaffRole(actor?.role) ? [] : reservedOptionIds(event));
+  const buyerFor = async () => actor || (waitlistOffer ? await prisma.user.findUnique({ where: { id: waitlistOffer.userId }, select: { id: true, role: true } }) : null);
+  const resolvedOptions = await Promise.all(lines.map(async (option: any) => {
+    const eventOption = event.eventOptions.find(eo => eo.id === option.eventOptionId);
+    if (!eventOption || reserved.has(eventOption.id)) fail(400, `Option with ID ${option.eventOptionId} not found for this event`);
+    if (!option.quantity || option.quantity < 1) fail(400, 'Quantity must be at least 1');
+    const qty = option.quantity;
+
+    // (A failing count doesn't block the sale — only a real shortage does.)
+    const stockCheck = await checkOptionStock(eventOption!, qty, waitlistOffer?.id, option.sessionId).catch(() => ({ available: true, remaining: null }));
+    if (!stockCheck.available) fail(400, `"${eventOption!.name}" is sold out or does not have enough stock (${stockCheck.remaining ?? 0} remaining).`);
+
+    const variantId: string | null = option.variantId || null;
+    if (variantId) {
+      const variant = (eventOption!.variants || []).find(v => v.id === variantId);
+      if (!variant) return fail(400, `Variant not found for option "${eventOption!.name}"`);
+      const vStock = await checkVariantStock(variant, qty, waitlistOffer?.id, option.sessionId).catch(() => ({ available: true, remaining: null }));
+      if (!vStock.available) fail(400, `Variant "${variant.name}" is sold out (${vStock.remaining ?? 0} remaining).`);
+    }
+
+    // Variant-level tiers take priority, then option-level tiers, then base prices, then
+    // the staff price for Staff and above.
+    const { priceSnapshot, appliedTierId } = await priceRequestedOption(eventOption, variantId, qty, await buyerFor());
+    return { ...option, variantId, appliedTierId, priceSnapshot: priceSnapshot ?? eventOption!.price };
+  }));
+
+  // Check a coupon code before anything is saved, so a bad code doesn't leave a
+  // half-made registration behind. It's applied (and re-checked under a lock) below.
+  if (couponCode) {
+    const buyer = actor ? { id: actor.id, role: actor.role, email: actor.email } : null;
+    await coupons.previewCoupon({ code: couponCode, eventId, user: buyer, lines: pendingCouponLines(event, resolvedOptions) });
+  }
+
+  // Check for existing non-cancelled registration for this user+event → merge instead
+  const existingReg = await prisma.registration.findFirst({
+    where: { userId, eventId, status: { not: 'cancelled' } },
+    include: { registrationOptions: true },
+  });
+
+  // Attendee names are checked against the places the registration will have after
+  // this purchase, counting names already given on an existing registration.
+  const cleanAttendees = attendeesUtil.validateAttendees(
+    event,
+    placesAfter(existingReg?.registrationOptions, resolvedOptions),
+    attendees,
+    existingReg ? await attendeesUtil.namedPlacesByKey(existingReg.id) : {},
+  );
+  if (ticketDelivery !== undefined && !(TICKET_DELIVERY as readonly string[]).includes(ticketDelivery)) fail(400, "ticketDelivery must be 'payer' or 'each'");
+
+  let registrationId: string;
+  let isNewRegistration = false;
+  if (existingReg) {
+    // Merge: add a new price tranche per requested option into the existing registration.
+    // Never overwrite an existing row's priceSnapshot/quantity in place — that would blend
+    // tickets bought at different early-bird prices into a single (wrong) price. Each
+    // purchase gets its own tranche; the RegistrationOption row stays a maintained aggregate.
+    for (const opt of resolvedOptions) {
+      // Match on eventOptionId + variantId (+ session, for picked sessions) for correct row
+      const existing = existingReg.registrationOptions.find(
+        ro => ro.eventOptionId === opt.eventOptionId && (ro.variantId || null) === (opt.variantId || null) && (ro.sessionId || null) === (opt.sessionId || null),
+      );
+      if (existing) {
+        await prisma.$transaction([
+          prisma.registrationOptionTranche.create({
+            data: { id: uuidv4(), registrationOptionId: existing.id, quantity: opt.quantity, priceSnapshot: opt.priceSnapshot, appliedTierId: opt.appliedTierId || null },
+          }),
+          prisma.registrationOption.update({
+            where: { id: existing.id },
+            data: { quantity: existing.quantity + opt.quantity, priceSnapshot: opt.priceSnapshot, appliedTierId: opt.appliedTierId || null, ...(existing.sessionId ? {} : { sessionIds: sessions.mergeSessionIds(existing.sessionIds, opt.sessionIds) }) },
+          }),
+        ]);
+      } else {
+        await prisma.registrationOption.create({
+          data: {
+            id: uuidv4(),
+            registrationId: existingReg.id,
+            eventOptionId: opt.eventOptionId,
+            quantity: opt.quantity,
+            variantId: opt.variantId || null,
+            sessionId: opt.sessionId || null,
+            sessionIds: opt.sessionIds || [],
+            appliedTierId: opt.appliedTierId || null,
+            priceSnapshot: opt.priceSnapshot,
+            tranches: { create: [{ id: uuidv4(), quantity: opt.quantity, priceSnapshot: opt.priceSnapshot, appliedTierId: opt.appliedTierId || null }] },
+          },
+        });
+      }
+    }
+    // Only downgrade from paid if the newly added items actually cost something
+    const newItemsCost = resolvedOptions.reduce((sum, opt) => sum + ((opt.priceSnapshot || 0) * (opt.quantity || 0)), 0);
+    await prisma.registration.update({
+      where: { id: existingReg.id },
+      data: existingReg.status === 'paid' && newItemsCost > 0 ? { status: 'partial_paid', updatedAt: new Date() } : { updatedAt: new Date() },
+    });
+    registrationId = existingReg.id;
+  } else {
+    isNewRegistration = true;
+    registrationId = uuidv4();
+    await prisma.registration.create({
+      data: {
+        id: registrationId,
+        userId,
+        eventId,
+        updatedAt: new Date(),
+        registrationOptions: {
+          create: resolvedOptions.map(option => ({
+            id: uuidv4(),
+            eventOptionId: option.eventOptionId,
+            quantity: option.quantity,
+            variantId: option.variantId || null,
+            sessionId: option.sessionId || null,
+            sessionIds: option.sessionIds || [],
+            appliedTierId: option.appliedTierId || null,
+            priceSnapshot: option.priceSnapshot,
+            tranches: { create: [{ id: uuidv4(), quantity: option.quantity, priceSnapshot: option.priceSnapshot, appliedTierId: option.appliedTierId || null }] },
+          })),
+        },
+      },
+    });
+  }
+
+  if (cleanAttendees.length > 0) {
+    await attendeesUtil.createAttendees(registrationId, cleanAttendees);
+    queueConsentRequests(registrationId);
+  }
+  if (waitlistOffer) {
+    await prisma.waitlistEntry.update({
+      where: { id: waitlistOffer.id },
+      data: { status: 'claimed', claimedAt: new Date(), registrationId, offerTokenHash: null },
+    });
+  }
+  if (ticketDelivery) {
+    await prisma.registration.update({ where: { id: registrationId }, data: { ticketDelivery: ticketDelivery as 'payer' | 'each' } });
+  }
+
+  // Bundle deals, then the coupon (or re-work an existing one over the merged items).
+  let couponError: string | null = null;
+  await coupons.recalculateRegistrationDiscount(registrationId);
+  if (couponCode) {
+    try {
+      await coupons.applyCouponToRegistration({ registrationId, code: couponCode });
+    } catch (e: any) {
+      // Lost a race for the last use since the check above — keep the registration.
+      if (!e.isCouponError) throw e;
+      couponError = e.message;
+    }
+  }
+  const load = () => prisma.registration.findUniqueOrThrow({
+    where: { id: registrationId },
+    include: { ...FULL_INCLUDE, couponRedemptions: ACTIVE_COUPONS_INCLUDE, bundleApplications: BUNDLE_APPS_INCLUDE, attendees: ATTENDEES_INCLUDE },
+  });
+  let registration = await load();
+
+  // Nothing owed: mark paid and issue tickets (unless a required form comes first).
+  let emailTicketsAfter = false;
+  try {
+    if (pricing.computeRegistrationTotalDue(registration, new Date()) === 0) {
+      if (registration.status !== 'paid') {
+        await prisma.registration.update({ where: { id: registrationId }, data: { status: 'paid', updatedAt: new Date() } });
+      }
+      const form = await prisma.eventForm.findUnique({ where: { eventId: registration.eventId } }).catch(() => null);
+      if (!(form && form.isRequired)) {
+        // Same generator as paid registrations: a ticket per named attendee, and one
+        // shared quantity ticket for the rest of each line.
+        await generateTicketsForRegistration(registrationId);
+        emailTicketsAfter = true;
+      }
+      registration = { ...registration, status: 'paid' };
+    }
+  } catch {
+    // ignore errors in auto-generation path; manual generation remains available
+  }
+
+  // Fire-and-forget: registration email first, then tickets (guarantees order)
+  const notifications = require('../utils/notifications') as { sendRegistrationEmails(id: string): Promise<unknown>; sendRegistrationUpdatedEmails(id: string): Promise<unknown> };
+  const ownerId = registration.userId;
+  void (async () => {
+    try {
+      if (isNewRegistration) await notifications.sendRegistrationEmails(registrationId);
+      else await notifications.sendRegistrationUpdatedEmails(registrationId);
+    } catch (e) { console.error('Failed to send registration emails:', e); }
+    if (emailTicketsAfter) {
+      try {
+        const { emailTickets } = require('../controllers/ticketController') as { emailTickets(req: unknown, res: unknown): Promise<unknown> };
+        const res: { status(): unknown; json(): void } = { status: () => res, json: () => {} };
+        await emailTickets({ user: { id: ownerId }, body: { registrationId } }, res);
+      } catch (e) { console.error('Error emailing tickets for free registration:', e); }
+    }
+  })();
+
+  // Funnel: this registration came from a tracked (cookie-consented) visit.
+  if (analyticsSessionId) {
+    const { recordSubmit } = require('../utils/analytics') as { recordSubmit(reg: unknown, sessionId: string): Promise<unknown> };
+    recordSubmit(registration, analyticsSessionId).catch((e: any) => console.warn('[analytics] submit not recorded:', e?.message || e));
+  }
+
+  return { registration: pricing.attachComputedTotals(registration), isNew: isNewRegistration, couponError };
+}
+
+/**
+ * Cancels a registration: the owner (not after the event, not once anything is paid) or an
+ * admin. Releases its coupon and offers its places to the waitlist.
+ */
+export async function cancelRegistration(registrationId: string, actor: { id: string; role: Role }, ip?: string) {
+  const registration = await prisma.registration.findUnique({
+    where: { id: registrationId },
+    include: { event: { select: { endDate: true } } },
+  });
+  if (!registration) return fail(404, 'Registration not found');
+
+  if (registration.userId !== actor.id && actor.role !== 'admin') fail(403, 'Not authorized to cancel this registration');
+
+  // If event is in the past, block self-cancellation (mirrors the edit block)
+  if (actor.role !== 'admin' && registration.event?.endDate && new Date(registration.event.endDate).getTime() < Date.now()) {
+    fail(400, 'This event has already ended; registration can no longer be cancelled');
+  }
+
+  try {
+    await assertEventOpen(registration.eventId);
+  } catch (e: any) {
+    throw new ServiceError(e.message === 'Event not found' ? 404 : 400, e.message);
+  }
+
+  if (registration.status === 'cancelled') fail(400, 'Registration is already cancelled');
+
+  // Non-admins cannot cancel a registration that has payments against it
+  if (actor.role !== 'admin') {
+    const paymentCount = await prisma.payment.count({ where: { registrationId: registration.id, amount: { gt: 0 } } });
+    if (paymentCount > 0) fail(403, 'This registration has payments recorded against it and cannot be self-cancelled. Please contact the organisation for assistance.');
+  }
+
+  const updated = await prisma.registration.update({ where: { id: registrationId }, data: { status: 'cancelled', updatedAt: new Date() } });
+  await coupons.releaseRegistrationCoupons(registrationId);
+  waitlist.queueWaitlist(registration.eventId);
+
+  // Only log when staff cancels on someone else's behalf — a routine self-service
+  // cancellation isn't an admin action worth cluttering the audit trail with.
+  if (registration.userId !== actor.id) {
+    logAdminAction({
+      actorId: actor.id, actorRole: actor.role, action: 'registration_cancelled', targetType: 'Registration', targetId: registrationId,
+      metadata: { registrationOwnerId: registration.userId }, ip,
+    });
+  }
+  return updated;
+}

backend/src/v2/index.ts

@@ -7,6 +7,7 @@ import auth from '../middleware/authMiddleware';
 // Resources: importing one registers its routes.
 import './resources/events';
 import './resources/me';
+import './resources/registrations';
 
 const pkg = require('../../package.json') as { version: string };
 

backend/src/v2/resources/me.ts

@@ -2,8 +2,9 @@ import { z } from 'zod';
 import { defineRoute } from '../route';
 import { ApiError } from '../errors';
 import { pageQuery, paged, single, skipTake, pageOf } from '../paging';
-import { eventRef, id, iso, isoDate } from '../schemas';
-import { prisma, computeRegistrationTotalDue } from '../legacy';
+import { id, iso, isoDate } from '../schemas';
+import { prisma } from '../legacy';
+import { registrationSummary, SUMMARY_INCLUDE, toSummary } from './registrations';
 
 const me = z.object({
   id,
@@ -32,26 +33,6 @@ export const getMe = defineRoute({
   },
 });
 
-const STATUSES = ['pending', 'confirmed', 'partial_paid', 'paid', 'cancelled'] as const;
-
-const myRegistration = z.object({
-  id,
-  status: z.enum(STATUSES),
-  createdAt: isoDate,
-  event: eventRef,
-  items: z.array(z.object({
-    ticket: z.string(),
-    variant: z.string().nullable(),
-    quantity: z.number().int(),
-    unitPrice: z.number(),
-  })),
-  totalDue: z.number().describe('In rand, after discounts'),
-  amountPaid: z.number().describe('In rand (refunds subtracted)'),
-  balance: z.number().describe('totalDue − amountPaid; 0 or less = nothing owing'),
-});
-
-const r2 = (n: number) => Math.round(n * 100) / 100;
-
 export const listMyRegistrations = defineRoute({
   method: 'get',
   path: '/me/registrations',
@@ -62,38 +43,16 @@ export const listMyRegistrations = defineRoute({
   query: pageQuery.extend({
     past: z.enum(['true', 'false']).default('false').transform(v => v === 'true').describe('Include past and cancelled registrations'),
   }),
-  response: paged(myRegistration),
+  response: paged(registrationSummary),
   async handler({ query, user }) {
     const now = new Date();
     const where = query.past
       ? { userId: user!.id }
       : { userId: user!.id, status: { not: 'cancelled' as const }, event: { endDate: { gte: now } } };
     const [rows, total] = await Promise.all([
-      prisma.registration.findMany({
-        where,
-        include: {
-          event: { select: { id: true, title: true, startDate: true, endDate: true } },
-          registrationOptions: { include: { eventOption: { include: { earlyBirdTiers: true } }, variant: { select: { name: true, price: true } }, tranches: true } },
-          payments: { select: { amount: true, createdAt: true } },
-        },
-        orderBy: [{ createdAt: 'desc' }, { id: 'desc' }],
-        ...skipTake(query),
-      }),
+      prisma.registration.findMany({ where, include: SUMMARY_INCLUDE, orderBy: [{ createdAt: 'desc' }, { id: 'desc' }], ...skipTake(query) }),
       prisma.registration.count({ where }),
     ]);
-    return pageOf(rows.map(r => {
-      const totalDue = r2(computeRegistrationTotalDue(r, now));
-      const amountPaid = r2(r.payments.reduce((s, p) => s + p.amount, 0));
-      return {
-        id: r.id,
-        status: r.status,
-        createdAt: iso(r.createdAt),
-        event: { id: r.event.id, title: r.event.title, startDate: iso(r.event.startDate), endDate: iso(r.event.endDate) },
-        items: r.registrationOptions.map(o => ({ ticket: o.eventOption?.name ?? '', variant: o.variant?.name ?? null, quantity: o.quantity, unitPrice: o.priceSnapshot ?? o.eventOption?.price ?? 0 })),
-        totalDue,
-        amountPaid,
-        balance: r2(totalDue - amountPaid),
-      };
-    }), total, query);
+    return pageOf(rows.map(r => toSummary(r, now)), total, query);
   },
 });

backend/src/v2/resources/registrations.ts

@@ -0,0 +1,187 @@
+import { z } from 'zod';
+import { defineRoute, type ApiUser } from '../route';
+import { ApiError, notFound } from '../errors';
+import { single } from '../paging';
+import { eventRef, id, idParams, iso, isoDate } from '../schemas';
+import { prisma, computeRegistrationTotalDue } from '../legacy';
+import { createRegistration, cancelRegistration } from '../../services/registrations';
+import { startRegistrationCheckout } from '../../services/payments';
+
+const STATUSES = ['pending', 'confirmed', 'partial_paid', 'paid', 'cancelled'] as const;
+
+/** A registration as v2 shows it to its owner. Also used by GET /me/registrations. */
+export const registrationSummary = z.object({
+  id,
+  status: z.enum(STATUSES),
+  createdAt: isoDate,
+  event: eventRef,
+  items: z.array(z.object({
+    ticket: z.string(),
+    variant: z.string().nullable(),
+    quantity: z.number().int(),
+    unitPrice: z.number(),
+  })),
+  totalDue: z.number().describe('In rand, after discounts'),
+  amountPaid: z.number().describe('In rand (refunds subtracted)'),
+  balance: z.number().describe('totalDue − amountPaid; 0 or less = nothing owing'),
+});
+
+const r2 = (n: number) => Math.round(n * 100) / 100;
+
+export const SUMMARY_INCLUDE = {
+  event: { select: { id: true, title: true, startDate: true, endDate: true } },
+  registrationOptions: { include: { eventOption: { include: { earlyBirdTiers: true } }, variant: { select: { name: true, price: true } }, tranches: true } },
+  payments: { select: { amount: true, createdAt: true } },
+} as const;
+
+type SummaryRow = {
+  id: string; status: (typeof STATUSES)[number]; createdAt: Date;
+  event: { id: string; title: string; startDate: Date; endDate: Date };
+  registrationOptions: { quantity: number; priceSnapshot: number | null; eventOption: { name: string; price: number } | null; variant: { name: string } | null }[];
+  payments: { amount: number }[];
+};
+
+export function toSummary(r: SummaryRow, now = new Date()): z.input<typeof registrationSummary> {
+  const totalDue = r2(computeRegistrationTotalDue(r, now));
+  const amountPaid = r2(r.payments.reduce((s, p) => s + p.amount, 0));
+  return {
+    id: r.id,
+    status: r.status,
+    createdAt: iso(r.createdAt),
+    event: { id: r.event.id, title: r.event.title, startDate: iso(r.event.startDate), endDate: iso(r.event.endDate) },
+    items: r.registrationOptions.map(o => ({ ticket: o.eventOption?.name ?? '', variant: o.variant?.name ?? null, quantity: o.quantity, unitPrice: o.priceSnapshot ?? o.eventOption?.price ?? 0 })),
+    totalDue,
+    amountPaid,
+    balance: r2(totalDue - amountPaid),
+  };
+}
+
+/** The owner's registration (admins may see anyone's); others get NOT_FOUND, not a hint it exists. */
+async function ownRegistration(registrationId: string, user: ApiUser) {
+  const r = await prisma.registration.findUnique({ where: { id: registrationId }, include: SUMMARY_INCLUDE });
+  if (!r || (r.userId !== user.id && user.role !== 'admin')) throw notFound('That registration');
+  return r;
+}
+
+const attendee = z.object({
+  eventOptionId: id,
+  variantId: id.nullish(),
+  name: z.string().trim().min(1).max(200),
+  email: z.string().trim().max(200).nullish(),
+  phone: z.string().trim().max(40).nullish(),
+  dateOfBirth: z.string().max(40).nullish().describe('YYYY-MM-DD (youth events)'),
+  gender: z.string().max(20).nullish(),
+  parentName: z.string().max(200).nullish(),
+  parentEmail: z.string().max(200).nullish(),
+  parentPhone: z.string().max(40).nullish(),
+});
+
+export const register = defineRoute({
+  method: 'post',
+  path: '/registrations',
+  tag: 'Registrations',
+  summary: 'Register for an event',
+  description: [
+    'Signed in, or as a guest for a free event that allows it (`guest` then required), or with a waitlist link (`waitlistToken`).',
+    'Registering again for the same event adds to the existing registration. When nothing is owed it is marked paid and tickets are issued; otherwise pay with `POST /registrations/{id}/checkout`.',
+    'A coupon that was valid when checked but used up a moment later is reported in `couponError`; the registration is still made.',
+  ].join('\n\n'),
+  access: 'optional',
+  status: 201,
+  body: z.object({
+    eventId: id,
+    options: z.array(z.object({
+      eventOptionId: id,
+      quantity: z.number().int().min(1).max(1000),
+      variantId: id.nullish(),
+      sessionIds: z.array(id).max(200).optional().describe('"Pick sessions" tickets: the sessions chosen'),
+    })).min(1).max(50),
+    guest: z.object({ name: z.string().trim().min(1).max(200), email: z.email().max(200), phone: z.string().trim().max(40).optional() }).optional(),
+    couponCode: z.string().trim().max(60).optional(),
+    attendees: z.array(attendee).max(500).optional().describe('Names for the places (events that collect them)'),
+    ticketDelivery: z.enum(['payer', 'each']).optional().describe('With attendees: tickets to the payer, or to each attendee'),
+    waitlistToken: z.string().max(200).optional(),
+    analyticsSessionId: z.string().max(100).optional(),
+  }),
+  response: single(registrationSummary.extend({
+    isNew: z.boolean().describe('false = added to an existing registration'),
+    couponError: z.string().nullable(),
+  })),
+  async handler({ body, user }) {
+    const { registration, isNew, couponError } = await createRegistration({
+      eventId: body.eventId,
+      options: body.options.map(o => ({ ...o, variantId: o.variantId ?? null })),
+      guestName: body.guest?.name,
+      guestEmail: body.guest?.email,
+      guestPhone: body.guest?.phone,
+      couponCode: body.couponCode,
+      attendees: body.attendees,
+      ticketDelivery: body.ticketDelivery,
+      waitlistToken: body.waitlistToken,
+      analyticsSessionId: body.analyticsSessionId,
+    }, user ? { id: user.id, role: user.role, email: user.email } : null);
+    const fresh = await prisma.registration.findUniqueOrThrow({ where: { id: registration.id }, include: SUMMARY_INCLUDE });
+    return { data: { ...toSummary(fresh), isNew, couponError } };
+  },
+});
+
+export const getRegistration = defineRoute({
+  method: 'get',
+  path: '/registrations/:id',
+  tag: 'Registrations',
+  summary: 'One of my registrations',
+  access: 'user',
+  params: idParams,
+  response: single(registrationSummary),
+  async handler({ params, user }) {
+    return { data: toSummary(await ownRegistration(params.id, user!)) };
+  },
+});
+
+export const cancel = defineRoute({
+  method: 'post',
+  path: '/registrations/:id/cancel',
+  tag: 'Registrations',
+  summary: 'Cancel my registration',
+  description: 'Not after the event has ended, and not once anything has been paid (the church can do that). Its places go to the waitlist.',
+  access: 'user',
+  params: idParams,
+  response: single(registrationSummary),
+  async handler({ params, user, req }) {
+    await ownRegistration(params.id, user!);
+    const { getClientIp } = require('../../utils/requestUtils') as { getClientIp(req: unknown): string };
+    await cancelRegistration(params.id, user!, getClientIp(req));
+    return { data: toSummary(await ownRegistration(params.id, user!)) };
+  },
+});
+
+export const checkout = defineRoute({
+  method: 'post',
+  path: '/registrations/:id/checkout',
+  tag: 'Registrations',
+  summary: 'Pay what I owe online',
+  description: [
+    'Starts a payment with the church\'s provider (Yoco or PayFast) and returns where to send the person (`redirectUrl`).',
+    'If an early-bird price ran out since the registration was made, nothing is started: `priceUpdated` is true with the new amount owing — show it, then call again.',
+  ].join('\n\n'),
+  access: 'user',
+  params: idParams,
+  body: z.object({
+    donationAmount: z.number().min(0).max(100000).optional().describe('An optional donation added on top, in rand'),
+    provider: z.string().max(40).optional().describe('yoco or payfast (default: the first one switched on)'),
+    successUrl: z.url().max(2000).optional(),
+    cancelUrl: z.url().max(2000).optional(),
+    failureUrl: z.url().max(2000).optional(),
+  }),
+  response: single(z.discriminatedUnion('priceUpdated', [
+    z.object({ priceUpdated: z.literal(true), newBalance: z.number(), message: z.string() }),
+    z.object({ priceUpdated: z.literal(false), checkoutId: z.string(), redirectUrl: z.string(), provider: z.string(), amount: z.number().describe('Charged now, in rand (with any donation)') }),
+  ])),
+  async handler({ params, body, user }) {
+    await ownRegistration(params.id, user!);
+    const result = await startRegistrationCheckout(params.id, user!, body);
+    if (result.priceUpdated) return { data: { priceUpdated: true as const, newBalance: result.newTotal, message: result.message } };
+    if (!result.redirectUrl) throw new ApiError('INTERNAL', 'The payment provider did not return a payment page.');
+    return { data: { priceUpdated: false as const, checkoutId: result.checkoutId, redirectUrl: result.redirectUrl, provider: result.provider, amount: result.amount } };
+  },
+});

backend/tests/v2.test.ts

@@ -7,7 +7,7 @@ import request from 'supertest';
 const mockDb = {
   event: { findMany: jest.fn(), count: jest.fn(), findFirst: jest.fn() },
   user: { findUnique: jest.fn() },
-  registration: { findMany: jest.fn(), count: jest.fn() },
+  registration: { findMany: jest.fn(), count: jest.fn(), findUnique: jest.fn(), findUniqueOrThrow: jest.fn() },
 };
 jest.mock('../src/config/db', () => mockDb);
 jest.mock('../src/utils/campuses', () => ({
@@ -28,7 +28,13 @@ jest.mock('../src/middleware/authMiddleware', () => {
   };
 });
 
+// The services are tested through v1 (e2e); here only how v2 calls them and maps their answers.
+const mockServices = { createRegistration: jest.fn(), cancelRegistration: jest.fn(), startRegistrationCheckout: jest.fn() };
+jest.mock('../src/services/registrations', () => ({ createRegistration: (...a: unknown[]) => mockServices.createRegistration(...a), cancelRegistration: (...a: unknown[]) => mockServices.cancelRegistration(...a) }));
+jest.mock('../src/services/payments', () => ({ startRegistrationCheckout: (...a: unknown[]) => mockServices.startRegistrationCheckout(...a) }));
+
 import { v2Router } from '../src/v2';
+import { ServiceError } from '../src/services/errors';
 import { routes } from '../src/v2/route';
 import { buildOpenApi } from '../src/v2/openapi';
 
@@ -150,3 +156,84 @@ describe('the API description', () => {
     expect(res.body.error.code).toBe('NOT_FOUND');
   });
 });
+
+describe('registrations', () => {
+  const row = (over: Record<string, unknown> = {}) => ({
+    id: 'r1', userId: 'u1', status: 'pending', createdAt: new Date('2026-10-01T10:00:00Z'), discountTotal: 0,
+    event: { id: 'e1', title: 'Youth Camp', startDate: new Date('2026-12-04T16:00:00Z'), endDate: new Date('2026-12-06T12:00:00Z') },
+    registrationOptions: [{ quantity: 1, priceSnapshot: 600, eventOption: { name: 'Camper', price: 600, earlyBirdTiers: [] }, variant: null, tranches: [] }],
+    payments: [], ...over,
+  });
+
+  test('registering passes a guest through and answers 201 with what is owing', async () => {
+    mockServices.createRegistration.mockResolvedValue({ registration: { id: 'r1' }, isNew: true, couponError: null });
+    mockDb.registration.findUniqueOrThrow.mockResolvedValue(row());
+    const res = await request(app).post('/api/v2/registrations').send({
+      eventId: 'e1', options: [{ eventOptionId: 'o1', quantity: 1 }], guest: { name: 'Thandi', email: 'thandi@example.com' },
+    });
+    expect(res.status).toBe(201);
+    expect(res.body.data).toMatchObject({ id: 'r1', isNew: true, couponError: null, totalDue: 600, balance: 600 });
+    expect(mockServices.createRegistration).toHaveBeenCalledWith(expect.objectContaining({ eventId: 'e1', guestName: 'Thandi', guestEmail: 'thandi@example.com' }), null);
+  });
+
+  test('a bad body never reaches the service', async () => {
+    const res = await request(app).post('/api/v2/registrations').send({ eventId: 'e1', options: [{ eventOptionId: 'o1', quantity: 0 }], guest: { name: 'T', email: 'not-an-email' } });
+    expect(res.status).toBe(400);
+    expect(Object.keys(res.body.error.fields).sort()).toEqual(['guest.email', 'options.0.quantity']);
+    expect(mockServices.createRegistration).not.toHaveBeenCalled();
+  });
+
+  test("the service's errors keep their meaning", async () => {
+    mockServices.createRegistration.mockRejectedValueOnce(new ServiceError(401, 'Authentication required for this event'));
+    const res = await request(app).post('/api/v2/registrations').send({ eventId: 'e1', options: [{ eventOptionId: 'o1', quantity: 1 }] });
+    expect(res.status).toBe(401);
+    expect(res.body.error).toEqual({ code: 'UNAUTHENTICATED', message: 'Authentication required for this event' });
+
+    mockServices.createRegistration.mockRejectedValueOnce(new ServiceError(400, '"Camper" is sold out or does not have enough stock (0 remaining).'));
+    const sold = await request(app).post('/api/v2/registrations').send({ eventId: 'e1', options: [{ eventOptionId: 'o1', quantity: 1 }] });
+    expect(sold.body.error.code).toBe('VALIDATION_FAILED');
+  });
+
+  test("someone else's registration is NOT_FOUND, and can't be cancelled or paid", async () => {
+    signedIn = { id: 'u2', role: 'user' };
+    mockDb.registration.findUnique.mockResolvedValue(row());
+    for (const [method, path] of [['get', '/api/v2/registrations/r1'], ['post', '/api/v2/registrations/r1/cancel'], ['post', '/api/v2/registrations/r1/checkout']] as const) {
+      const res = await request(app)[method](path).send({});
+      expect([path, res.status]).toEqual([path, 404]);
+    }
+    expect(mockServices.cancelRegistration).not.toHaveBeenCalled();
+    expect(mockServices.startRegistrationCheckout).not.toHaveBeenCalled();
+  });
+
+  test('cancelling my registration', async () => {
+    signedIn = { id: 'u1', role: 'user' };
+    mockDb.registration.findUnique.mockResolvedValueOnce(row()).mockResolvedValueOnce(row({ status: 'cancelled' }));
+    mockServices.cancelRegistration.mockResolvedValue({});
+    const res = await request(app).post('/api/v2/registrations/r1/cancel');
+    expect(res.status).toBe(200);
+    expect(res.body.data.status).toBe('cancelled');
+  });
+
+  test('checkout: the payment page, or the new balance when an early-bird price ran out', async () => {
+    signedIn = { id: 'u1', role: 'user' };
+    mockDb.registration.findUnique.mockResolvedValue(row());
+    mockServices.startRegistrationCheckout.mockResolvedValueOnce({ checkoutId: 'c1', redirectUrl: 'https://pay.example/c1', provider: 'yoco', amount: 650, registration: {} });
+    const pay = await request(app).post('/api/v2/registrations/r1/checkout').send({ donationAmount: 50 });
+    expect(pay.body.data).toEqual({ priceUpdated: false, checkoutId: 'c1', redirectUrl: 'https://pay.example/c1', provider: 'yoco', amount: 650 });
+    expect(mockServices.startRegistrationCheckout).toHaveBeenCalledWith('r1', signedIn, { donationAmount: 50 });
+
+    mockServices.startRegistrationCheckout.mockResolvedValueOnce({ priceUpdated: true, newTotal: 700, message: 'Prices changed' });
+    const changed = await request(app).post('/api/v2/registrations/r1/checkout').send({});
+    expect(changed.body.data).toEqual({ priceUpdated: true, newBalance: 700, message: 'Prices changed' });
+  });
+});
+
+describe('the frontend types', () => {
+  test('frontend/src/lib/api-v2/openapi.json is up to date (run `npm run api:types` in the repo root)', () => {
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
+    const { OPENAPI_FILE, currentDocument } = require('../scripts/openapi');
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
+    const saved = require('fs').readFileSync(OPENAPI_FILE, 'utf8').replace(/\r\n/g, '\n');
+    expect(saved).toBe(currentDocument());
+  });
+});

docs/HANDOVER.md

@@ -1,6 +1,6 @@
 # Handover — where things stand and how to carry on
 
-Last updated: 2026-10-29, after **1.51.0** (and Hub 1.5.0). The plan itself is in
+Last updated: 2026-10-29, after **1.51.1** (and Hub 1.5.0). The plan itself is in
 [ROADMAP-v2.md](./ROADMAP-v2.md) (decisions table at the end); the previous round of
 features is in [FEATURES-ROUND-1.md](./FEATURES-ROUND-1.md).
 
@@ -14,6 +14,7 @@ encrypted settings unreadable or break existing installs.
 
 | Version | What |
 |---------|------|
+| 1.51.1 | **v2 registrations and payments**: register, get, cancel, checkout; create/cancel moved to `src/services/registrations.ts`, online checkout to `src/services/payments.ts` (v1 uses them too); typed frontend calls (`apiV2`, `npm run api:types`); register page, Pay now and My Events cancel on v2 |
 | 1.51.0 | **TypeScript backend + `/api/v2` foundations** (§14): tsconfig (`allowJs`), build to `dist/`, launcher `src/index.js` → `src/app.js`; v2 route declarations with zod → validation, response stripping and OpenAPI 3.1 at `/docs/v2`; first endpoints events, event, me, my registrations. Tests `tests/v2.test.ts`, e2e `e2e/api-v2.spec.ts` |
 | 1.50.2 | Searchable **event picker** (`components/shared/EventPicker.tsx`) on staff/supervisor pages and the kiosk; searchable reports events list; **How webhooks work** guide on Site settings → Webhooks (examples from `EVENT_TYPES[].example`). e2e `e2e/event-picker.spec.ts` |
 | 1.50.1 | Long lists: audit-log search/role filter/all actions and inclusive To date, data-request search and paging, webhook-delivery status filter and Load older, supervisor Payments loads only what it needs (`unpaid`, `userId`, `from`, `donations` filters). `components/shared/Pager.tsx`; e2e `e2e/long-lists.spec.ts` |
@@ -62,9 +63,9 @@ encrypted settings unreadable or break existing installs.
 Hub 1.1.0 is deployed with update requests rolled out, and `scripts/install.sh` has been tried on
 a test server (both done 2026-10-28).
 
-1. **1.51.1 — v2 write endpoints** (register, pay, check-in, users; split `registrationController`
-   and `eventController` into TS services as they move; typed frontend calls from the schemas), then
-   **1.51.2 — the rest of v2, Express 5, v1 deprecation headers**, then **2.0.0 — AI helpers** (§15).
+1. **1.51.2 — v2 check-in and accounts** (ticket scan and manual check-in, sign up, log in,
+   profile; move them into TS services as 1.51.1 did), then **1.51.3 — the rest of v2, Express 5,
+   v1 deprecation headers and v2-shaped global middleware**, then **2.0.0 — AI helpers** (§15).
    Languages (Afrikaans, §10) are removed from scope (2026-10-28).
 2. AI rules decided 2026-10-29 (see §15 in the roadmap): the AI buttons show only when the
    licence's monthly cap is above R0, and are disabled (not hidden) once it's reached. The Hub
@@ -471,6 +472,13 @@ a test server (both done 2026-10-28).
   The response is parsed by its schema: unknown fields are dropped, and a mismatch is a 500 plus a
   log line (tests catch it). Staff/supervisor routes must declare `campusScope` (start-up fails
   otherwise).
+- **Services** (`src/services/*.ts`, 1.51.1): business logic both API versions call. Throw
+  `ServiceError(status, message)` (`fail()`); v1 controllers keep their old answers (mostly 400
+  for any error), v2 maps the status to its codes. Helper errors without a status count as 400,
+  like v1. JS helpers are required with a typed signature at the top of each service.
+- **Frontend v2 calls:** `apiV2("post", "/registrations/{id}/cancel", { params: { id }, authToken })`
+  (`frontend/src/lib/apiV2.ts`). After adding or changing a v2 route run `npm run api:types` in the
+  repo root and commit `frontend/src/lib/api-v2/` (`tests/v2.test.ts` fails while it's stale).
 - Not yet v2-shaped: the global middleware in front of every route (rate limit, impersonation
   read-only guard, licence read-only) still answers `{ message }`. Do that with 1.51.2.
 

docs/ROADMAP-v2.md

@@ -39,7 +39,8 @@ report** and 1.47.3 **season passes** shipped — §6 is done. 1.48.0 **outbound
 shipped; 1.49.1 **bulk actions** and 1.49.2 **saved filters** shipped — §9 is done. Languages
 (Afrikaans) are removed from scope (2026-10-28), so everything after moves up by one. 1.50.0 **accessibility
 pass** shipped. 1.50.1 **pagination and search on long lists** and 1.50.2 **event picker and webhook guide** shipped. 1.51.0 **TypeScript backend and `/api/v2`
-foundations** shipped. **Next: 1.51.1 v2 write endpoints, then 1.51.2.**
+foundations** and 1.51.1 **v2 registrations and payments** shipped. **Next: 1.51.2 v2 check-in and
+accounts, then 1.51.3.**
 
 **Repositories:**
 
@@ -1007,7 +1008,7 @@ income justify the hardware:
 | 8 | 1.45.0 ✅ – 1.46.0 ✅ | Kids check-in, Volunteer rosters | Depend on sessions and campuses |
 | 9 | 1.47.0 ✅ – 1.47.3 ✅, 1.48.0 ✅ | Event series & cloning (1.47.0 clone, 1.47.1 series, 1.47.2 year-on-year reports, 1.47.3 season pass), Outbound webhooks (Wallet passes removed from scope) | Smaller, independent wins |
 | 10 | 1.49.0 ✅ – 1.49.2 ✅, 1.50.0 ✅, 1.50.1 ✅, 1.50.2 ✅ | Admin dashboard/Ctrl+K/bulk actions/saved filters, Accessibility pass, pagination and search on long lists, event picker and webhook guide (Afrikaans removed from scope) | Polish before the big release |
-| 11 | 1.51.0 ✅, 1.51.1, 1.51.2 | TypeScript backend + OpenAPI + `/api/v2` alongside v1: 1.51.0 foundations (build, launcher, route declarations, errors, paging, OpenAPI at `/docs/v2`, first read endpoints); 1.51.1 write endpoints and services, typed frontend calls; 1.51.2 the rest, Express 5, v1 deprecation headers | The breaking-change groundwork |
+| 11 | 1.51.0 ✅, 1.51.1 ✅, 1.51.2, 1.51.3 | TypeScript backend + OpenAPI + `/api/v2` alongside v1: 1.51.0 foundations (build, launcher, route declarations, errors, paging, OpenAPI at `/docs/v2`, first read endpoints); 1.51.1 registrations and payments as TS services, typed frontend calls; 1.51.2 check-in and accounts; 1.51.3 the rest, Express 5, v1 deprecation headers | The breaking-change groundwork |
 | 12 | **2.0.0** | **AI helpers** (§15 — headline feature: draft an event, summarise reports and feedback, draft messages, improve text; through the Hub with a rand cap per licence), v1 API removed, migration guide, marketing site/docs for selling | The release. AI needs the Hub (phase 6) for the key, metering and caps |
 
 Each phase should add matching help content (`frontend/src/content/help/`),

e2e/api-v2.spec.ts

@@ -35,6 +35,23 @@ test.describe("API v2", () => {
     expect(regs.data.length).toBe(Math.min(25, regs.meta.total));
   });
 
+  test("register for a free event, then cancel it", async ({ request }) => {
+    const headers = { Authorization: `Bearer ${seed().users.staff.token}` };
+    const event = (await (await request.get(`${API}/api/v2/events/${seed().events.free}`)).json()).data;
+    const made = await request.post(`${API}/api/v2/registrations`, { headers, data: { eventId: event.id, options: [{ eventOptionId: event.ticketOptions[0].id, quantity: 1 }] } });
+    expect(made.status()).toBe(201);
+    const reg = (await made.json()).data;
+    expect(reg).toMatchObject({ status: "paid", balance: 0, event: { id: event.id } });
+
+    const someoneElse = await request.post(`${API}/api/v2/registrations/${reg.id}/cancel`, { headers: { Authorization: `Bearer ${seed().users.user.token}` } });
+    expect((await someoneElse.json()).error.code).toBe("NOT_FOUND");
+
+    const cancelled = await request.post(`${API}/api/v2/registrations/${reg.id}/cancel`, { headers });
+    expect((await cancelled.json()).data.status).toBe("cancelled");
+    const again = await request.post(`${API}/api/v2/registrations/${reg.id}/cancel`, { headers });
+    expect((await again.json()).error).toMatchObject({ code: "VALIDATION_FAILED", message: "Registration is already cancelled" });
+  });
+
   test("an admin can read the OpenAPI reference at /docs/v2", async ({ page, request }) => {
     const headers = { Authorization: `Bearer ${seed().users.user.token}` };
     expect((await request.get(`${API}/api/v2/openapi.json`, { headers })).status()).toBe(403);

frontend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "hope-events-frontend",
-  "version": "1.51.0",
+  "version": "1.51.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "hope-events-frontend",
-      "version": "1.51.0",
+      "version": "1.51.1",
       "dependencies": {
         "@dnd-kit/core": "^6.3.1",
         "@hookform/resolvers": "^5.2.1",
@@ -54,6 +54,7 @@
         "autoprefixer": "^10.4.21",
         "eslint": "^9",
         "eslint-config-next": "^15.5.24",
+        "openapi-typescript": "^7.13.0",
         "postcss": "^8.5.6",
         "tailwindcss": "3.4",
         "typescript": "^5"
@@ -2770,6 +2771,99 @@
       "integrity": "sha512-JtyZR+mqgBibTo8xea3B6ZRmzZiM/YeVBtUkas6zMuXjAlfIFIW2FgqeM9eLyvEaYX66vr6DJMK+4U6LV0KhNw==",
       "license": "MIT"
     },
+    "node_modules/@redocly/ajv": {
+      "version": "8.11.2",
+      "resolved": "https://registry.npmjs.org/@redocly/ajv/-/ajv-8.11.2.tgz",
+      "integrity": "sha512-io1JpnwtIcvojV7QKDUSIuMN/ikdOUd1ReEnUnMKGfDVridQZ31J0MmIuqwuRjWDZfmvr+Q0MqCcfHM2gTivOg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fast-deep-equal": "^3.1.1",
+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2",
+        "uri-js-replace": "^1.0.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
+    "node_modules/@redocly/config": {
+      "version": "0.22.0",
+      "resolved": "https://registry.npmjs.org/@redocly/config/-/config-0.22.0.tgz",
+      "integrity": "sha512-gAy93Ddo01Z3bHuVdPWfCwzgfaYgMdaZPcfL7JZ7hWJoK9V0lXDbigTWkhiPFAaLWzbOJ+kbUQG1+XwIm0KRGQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@redocly/openapi-core": {
+      "version": "1.34.22",
+      "resolved": "https://registry.npmjs.org/@redocly/openapi-core/-/openapi-core-1.34.22.tgz",
+      "integrity": "sha512-dEyx4uHh6Pc6ZkdU9Xe8rA4h12Odq6QKU/fqseBn07xwVwskhHiF3KHhqmw5BR+jAiFTvKTmwCafFql/k1pSzA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@redocly/ajv": "8.11.2",
+        "@redocly/config": "0.22.0",
+        "colorette": "1.4.0",
+        "https-proxy-agent": "7.0.6",
+        "js-levenshtein": "1.1.6",
+        "js-yaml": "4.3.2",
+        "minimatch": "5.1.9",
+        "pluralize": "8.0.0",
+        "yaml-ast-parser": "0.0.43"
+      },
+      "engines": {
+        "node": ">=18.17.0",
+        "npm": ">=9.5.0"
+      }
+    },
+    "node_modules/@redocly/openapi-core/node_modules/agent-base": {
+      "version": "7.1.4",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.4.tgz",
+      "integrity": "sha512-MnA+YT8fwfJPgBx3m60MNqakm30XOkyIoH1y6huTQvC0PwZG7ki8NacLBcrPbNoo8vEZy7Jpuk7+jMO+CUovTQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 14"
+      }
+    },
+    "node_modules/@redocly/openapi-core/node_modules/brace-expansion": {
+      "version": "2.1.7",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.7.tgz",
+      "integrity": "sha512-uZbew1NqdmPDTMJ8ah1y+b+9QEJrfkXFk3RcTQw3X0jW/xRUvFKsg1CfQdSYGdTbXZWExtU3J3ccxtnfw1Fi0g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/@redocly/openapi-core/node_modules/https-proxy-agent": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-7.0.6.tgz",
+      "integrity": "sha512-vK9P5/iUfdl95AI+JVyUuIcVtd4ofvtrOr3HNtM2yxC9bnMbEdp3x01OhQNnjb8IJYi38VlTE3mBXwcfvywuSw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "agent-base": "^7.1.2",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 14"
+      }
+    },
+    "node_modules/@redocly/openapi-core/node_modules/minimatch": {
+      "version": "5.1.9",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.9.tgz",
+      "integrity": "sha512-7o1wEA2RyMP7Iu7GNba9vc0RWWGACJOCZBJX2GJWip0ikV+wcOsgVuY9uE8CPiyQhkGFSlhuSkZPavN7u1c2Fw==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/@rollup/plugin-commonjs": {
       "version": "28.0.1",
       "resolved": "https://registry.npmjs.org/@rollup/plugin-commonjs/-/plugin-commonjs-28.0.1.tgz",
@@ -4650,6 +4744,16 @@
         "ajv": "^8.8.2"
       }
     },
+    "node_modules/ansi-colors": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.3.tgz",
+      "integrity": "sha512-/6w/C21Pm1A7aZitlI5Ni/2J6FFQN8i1Cvz3kHABAAbw93v/NlvKdVOqz7CCWz/3iv/JplRSEEZ83XION15ovw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/ansi-regex": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
@@ -5208,6 +5312,13 @@
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
     },
+    "node_modules/change-case": {
+      "version": "5.4.4",
+      "resolved": "https://registry.npmjs.org/change-case/-/change-case-5.4.4.tgz",
+      "integrity": "sha512-HRQyTk2/YPEkt9TnUPbOpr64Uw3KOicFWPVBb+xiHvd6eBx/qPr9xqfBFDT8P2vWsvvz4jbEkfDe71W3VyNu2w==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/chokidar": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.6.0.tgz",
@@ -5316,6 +5427,13 @@
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
       "license": "MIT"
     },
+    "node_modules/colorette": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-1.4.0.tgz",
+      "integrity": "sha512-Y2oEozpomLn7Q3HFP7dpww7AtMJplbM9lGZP6RDfHqmbeRjiwRg4n6VM6j4KLmRke85uWEI7JqF17f3pqdRA0g==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/commander": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/commander/-/commander-4.1.1.tgz",
@@ -6903,6 +7021,19 @@
         "node": ">=0.8.19"
       }
     },
+    "node_modules/index-to-position": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/index-to-position/-/index-to-position-1.2.0.tgz",
+      "integrity": "sha512-Yg7+ztRkqslMAS2iFaU+Oa4KTSidr63OsFGlOrJoW981kIYO3CGCS3wA95P1mUi/IVSJkn0D479KTJpVpvFNuw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/internal-slot": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/internal-slot/-/internal-slot-1.1.0.tgz",
@@ -7446,6 +7577,16 @@
         "jiti": "bin/jiti.js"
       }
     },
+    "node_modules/js-levenshtein": {
+      "version": "1.1.6",
+      "resolved": "https://registry.npmjs.org/js-levenshtein/-/js-levenshtein-1.1.6.tgz",
+      "integrity": "sha512-X2BB11YZtrRqY4EnQcLX5Rh373zbK4alC1FW7D7MBhL2gtcC17cTnr6DmfHZeS0s2rTHjUTMMHfG7gO8SSdw+g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -7498,8 +7639,7 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
       "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
-      "license": "MIT",
-      "peer": true
+      "license": "MIT"
     },
     "node_modules/json-stable-stringify-without-jsonify": {
       "version": "1.0.1",
@@ -8134,6 +8274,50 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/openapi-typescript": {
+      "version": "7.13.0",
+      "resolved": "https://registry.npmjs.org/openapi-typescript/-/openapi-typescript-7.13.0.tgz",
+      "integrity": "sha512-EFP392gcqXS7ntPvbhBzbF8TyBA+baIYEm791Hy5YkjDYKTnk/Tn5OQeKm5BIZvJihpp8Zzr4hzx0Irde1LNGQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@redocly/openapi-core": "^1.34.6",
+        "ansi-colors": "^4.1.3",
+        "change-case": "^5.4.4",
+        "parse-json": "^8.3.0",
+        "supports-color": "^10.2.2",
+        "yargs-parser": "^21.1.1"
+      },
+      "bin": {
+        "openapi-typescript": "bin/cli.js"
+      },
+      "peerDependencies": {
+        "typescript": "^5.x"
+      }
+    },
+    "node_modules/openapi-typescript/node_modules/supports-color": {
+      "version": "10.2.2",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-10.2.2.tgz",
+      "integrity": "sha512-SS+jx45GF1QjgEXQx4NJZV9ImqmO2NPz5FNsIHrsDjh2YsHnawpan7SNQ1o8NuhrbHZy9AZhIoCUiCeaW/C80g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/supports-color?sponsor=1"
+      }
+    },
+    "node_modules/openapi-typescript/node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/optionator": {
       "version": "0.9.4",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
@@ -8223,6 +8407,37 @@
         "node": ">=6"
       }
     },
+    "node_modules/parse-json": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-8.3.0.tgz",
+      "integrity": "sha512-ybiGyvspI+fAoRQbIPRddCcSTV9/LsJbf0e/S85VLowVGzRmokfneg2kwVW/KU5rOXrPSbF1qAKPMgNTqqROQQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/code-frame": "^7.26.2",
+        "index-to-position": "^1.1.0",
+        "type-fest": "^4.39.1"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/parse-json/node_modules/type-fest": {
+      "version": "4.41.0",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-4.41.0.tgz",
+      "integrity": "sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA==",
+      "dev": true,
+      "license": "(MIT OR CC0-1.0)",
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/path-exists": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
@@ -8300,6 +8515,16 @@
         "node": ">= 6"
       }
     },
+    "node_modules/pluralize": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-8.0.0.tgz",
+      "integrity": "sha512-Nc3IT5yHzflTfbjgqWcCPpo7DaKy4FnpB0l/zCAW0Tc7jxAiuqSxHasntB3D7887LSrA93kDJ9IXovxJYxyLCA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/pngjs": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-5.0.0.tgz",
@@ -8813,7 +9038,6 @@
       "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
       "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -10051,6 +10275,13 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/uri-js-replace": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/uri-js-replace/-/uri-js-replace-1.0.2.tgz",
+      "integrity": "sha512-VeBBt/nMxedczht3KDL2yBBMJqIxpCQLMZp3UJ1otcWwUHdQW4IiyHpJivExzSK+FdxTowRfGL4FmwDqH9+S8Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/use-callback-ref": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/use-callback-ref/-/use-callback-ref-1.3.3.tgz",
@@ -10328,6 +10559,13 @@
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
       "license": "ISC"
     },
+    "node_modules/yaml-ast-parser": {
+      "version": "0.0.43",
+      "resolved": "https://registry.npmjs.org/yaml-ast-parser/-/yaml-ast-parser-0.0.43.tgz",
+      "integrity": "sha512-2PTINUwsRqSd+s8XxKaJWQlUuEMHJQyEuh2edBbW8KNJz0SJPwUSD2zRWqezFEdN7IzAgeuYHFUCF7o8zRdZ0A==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
     "node_modules/yargs": {
       "version": "15.4.1",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",

frontend/package.json

@@ -1,12 +1,13 @@
 {
   "name": "hope-events-frontend",
-  "version": "1.51.0",
+  "version": "1.51.1",
   "private": true,
   "scripts": {
     "dev": "next dev --turbopack",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint"
+    "lint": "next lint",
+    "api:types": "openapi-typescript src/lib/api-v2/openapi.json -o src/lib/api-v2/schema.d.ts"
   },
   "dependencies": {
     "@dnd-kit/core": "^6.3.1",
@@ -55,6 +56,7 @@
     "autoprefixer": "^10.4.21",
     "eslint": "^9",
     "eslint-config-next": "^15.5.24",
+    "openapi-typescript": "^7.13.0",
     "postcss": "^8.5.6",
     "tailwindcss": "3.4",
     "typescript": "^5"

frontend/src/app/dashboard/user/page.tsx

@@ -2,6 +2,7 @@
 import React, { useEffect, useMemo, useState } from "react";
 import { useAuth } from "@/hooks/useAuth";
 import { apiFetch, createFullPaymentCheckout } from "@/lib/api";
+import { apiV2 } from "@/lib/apiV2";
 import { useOnlinePayments } from "@/lib/onlinePayments";
 import { useRouter } from "next/navigation";
 import { formatDate } from "@/lib/date";
@@ -454,10 +455,7 @@ export default function UserDashboardPage() {
     if (!token || !activeRegId) return;
     setCancelLoading(true);
     try {
-      await apiFetch(`/api/registrations/${encodeURIComponent(activeRegId)}`, {
-        method: 'DELETE',
-        authToken: token,
-      });
+      await apiV2("post", "/registrations/{id}/cancel", { params: { id: activeRegId }, authToken: token });
       const myRegs = await apiFetch<Registration[]>(`/api/registrations/myregistrations?showPast=${showPast ? '1' : '0'}`, { authToken: token });
       setRegistrations(myRegs);
       setActiveRegId(null);

frontend/src/app/register/[eventId]/RegisterForm.tsx

@@ -3,6 +3,7 @@
 import React, { useEffect, useMemo, useState } from "react";
 import { useAuth } from "@/hooks/useAuth";
 import { apiFetch } from "@/lib/api";
+import { apiV2 } from "@/lib/apiV2";
 import { useOnlinePayments } from "@/lib/onlinePayments";
 import { CouponCodeField, AppliedCoupon } from "@/components/shared/CouponCodeField";
 import { BundleBuilder, BundleOffers, BundleSavings, useBundleQuote } from "@/components/shared/BundleDeals";
@@ -552,6 +553,15 @@ export default function RegisterForm({ event: baseEvent }: { event: RegisterEven
       setError(`The minimum donation is R${MIN_DONATION}. Choose None to skip it.`);
       return;
     }
+    // Registers through API v2; returns the new registration (balance = what's owed now).
+    const register = async (extra: { couponCode?: string; waitlistToken?: string; guest?: { name: string; email: string; phone?: string } }, authToken?: string | null) => {
+      const named = namedAttendees();
+      const { data } = await apiV2("post", "/registrations", {
+        body: { eventId, options: items, analyticsSessionId: analyticsSessionId(), ...(named.length > 0 ? { attendees: named, ticketDelivery: delivery } : {}), ...extra },
+        authToken,
+      });
+      return data;
+    };
     const donationParam = donation > 0 ? `&donation=${encodeURIComponent(donation.toFixed(2))}` : "";
 
     // Claim link without logging in: the link identifies the person.
@@ -559,11 +569,8 @@ export default function RegisterForm({ event: baseEvent }: { event: RegisterEven
       try {
         setError(null);
         setCreatingRegistration(true);
-        const res = await apiFetch<{ id: string; totalDueComputed?: number }>("/api/registrations", {
-          method: "POST",
-          body: { eventId, options: items, waitlistToken, analyticsSessionId: analyticsSessionId(), ...(namedAttendees().length > 0 ? { attendees: namedAttendees(), ticketDelivery: delivery } : {}) },
-        });
-        if (res?.id) window.location.href = `/registration/success?registrationId=${encodeURIComponent(res.id)}&totalDue=${encodeURIComponent((res.totalDueComputed ?? payable).toFixed(2))}`;
+        const res = await register({ waitlistToken });
+        window.location.href = `/registration/success?registrationId=${encodeURIComponent(res.id)}&totalDue=${encodeURIComponent(Math.max(0, res.balance).toFixed(2))}`;
       } catch (e) {
         setError(errorMessage(e) || "Registration failed");
       } finally {
@@ -581,21 +588,10 @@ export default function RegisterForm({ event: baseEvent }: { event: RegisterEven
       try {
         setError(null);
         setCreatingRegistration(true);
-        const res = await apiFetch<{ id: string; totalDueComputed?: number; couponError?: string }>("/api/registrations", {
-          method: "POST",
-          body: {
-            eventId,
-            options: items,
-            ...(coupon ? { couponCode: coupon.code } : {}),
-            analyticsSessionId: analyticsSessionId(),
-            ...(namedAttendees().length > 0 ? { attendees: namedAttendees(), ticketDelivery: delivery } : {}),
-            ...(waitlistToken ? { waitlistToken } : {}),
-          },
-          authToken: token,
-        });
-        if (res?.id) {
+        const res = await register({ ...(coupon ? { couponCode: coupon.code } : {}), ...(waitlistToken ? { waitlistToken } : {}) }, token);
+        {
           const hasForm = !!(event?.form && Array.isArray(event.form.fields) && event.form.fields.length > 0);
-          const due = res.totalDueComputed ?? payable;
+          const due = Math.max(0, res.balance);
           const next = hasForm
             ? `/forms?registrationId=${encodeURIComponent(res.id)}${donationParam}`
             : `/registration/success?registrationId=${encodeURIComponent(res.id)}&totalDue=${encodeURIComponent((due || 0).toFixed(2))}${donationParam}`;
@@ -628,15 +624,8 @@ export default function RegisterForm({ event: baseEvent }: { event: RegisterEven
     try {
       setError(null);
       setCreatingRegistration(true);
-      const res = await apiFetch<{ id: string }>("/api/registrations", {
-        method: "POST",
-        body: {
-          eventId, options: items, guestName: guestName.trim(), guestEmail: guestEmail.trim(), guestPhone: guestPhone.trim() || undefined,
-          analyticsSessionId: analyticsSessionId(),
-          ...(namedAttendees().length > 0 ? { attendees: namedAttendees(), ticketDelivery: delivery } : {}),
-        },
-      });
-      if (res?.id) {
+      const res = await register({ guest: { name: guestName.trim(), email: guestEmail.trim(), ...(guestPhone.trim() ? { phone: guestPhone.trim() } : {}) } });
+      {
         const hasForm = !!(event?.form && Array.isArray(event.form.fields) && event.form.fields.length > 0);
         if (hasForm) {
           window.location.href = `/forms?registrationId=${encodeURIComponent(res.id)}`;

frontend/src/lib/api-v2/schema.d.ts

@@ -0,0 +1,838 @@
+/**
+ * This file was auto-generated by openapi-typescript.
+ * Do not make direct changes to the file.
+ */
+
+export interface paths {
+    "/events": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * Upcoming public events
+         * @description Events anyone can see (active, not hidden, live) that have not ended, soonest first.
+         *
+         *     **Who:** Anyone.
+         */
+        get: operations["getEvents"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/events/{id}": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * One public event
+         * @description With its ticket options (internal kids check-in and volunteer tickets left out) and sessions. Hidden events can be fetched by id (they are unlisted, not private).
+         *
+         *     **Who:** Anyone.
+         */
+        get: operations["getEventsId"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/registrations": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put?: never;
+        /**
+         * Register for an event
+         * @description Signed in, or as a guest for a free event that allows it (`guest` then required), or with a waitlist link (`waitlistToken`).
+         *
+         *     Registering again for the same event adds to the existing registration. When nothing is owed it is marked paid and tickets are issued; otherwise pay with `POST /registrations/{id}/checkout`.
+         *
+         *     A coupon that was valid when checked but used up a moment later is reported in `couponError`; the registration is still made.
+         *
+         *     **Who:** Anyone; signed-in staff may see more.
+         */
+        post: operations["postRegistrations"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/registrations/{id}": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * One of my registrations
+         * @description **Who:** Any signed-in person.
+         */
+        get: operations["getRegistrationsId"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/registrations/{id}/cancel": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put?: never;
+        /**
+         * Cancel my registration
+         * @description Not after the event has ended, and not once anything has been paid (the church can do that). Its places go to the waitlist.
+         *
+         *     **Who:** Any signed-in person.
+         */
+        post: operations["postRegistrationsIdCancel"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/registrations/{id}/checkout": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put?: never;
+        /**
+         * Pay what I owe online
+         * @description Starts a payment with the church's provider (Yoco or PayFast) and returns where to send the person (`redirectUrl`).
+         *
+         *     If an early-bird price ran out since the registration was made, nothing is started: `priceUpdated` is true with the new amount owing — show it, then call again.
+         *
+         *     **Who:** Any signed-in person.
+         */
+        post: operations["postRegistrationsIdCheckout"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/me": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * The signed-in person
+         * @description **Who:** Any signed-in person.
+         */
+        get: operations["getMe"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/me/registrations": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * My registrations
+         * @description Newest first. By default only ones for events that have not ended, and not cancelled; `past=true` lists everything.
+         *
+         *     **Who:** Any signed-in person.
+         */
+        get: operations["getMeRegistrations"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+}
+export type webhooks = Record<string, never>;
+export interface components {
+    schemas: {
+        Error: {
+            error: {
+                /** @enum {string} */
+                code: "VALIDATION_FAILED" | "UNAUTHENTICATED" | "FORBIDDEN" | "NOT_FOUND" | "CONFLICT" | "RATE_LIMITED" | "READ_ONLY" | "INTERNAL";
+                message: string;
+                /** @description Per-field problems (VALIDATION_FAILED only) */
+                fields?: {
+                    [key: string]: string;
+                };
+            };
+        };
+    };
+    responses: never;
+    parameters: never;
+    requestBodies: never;
+    headers: never;
+    pathItems: never;
+}
+export type $defs = Record<string, never>;
+export interface operations {
+    getEvents: {
+        parameters: {
+            query?: {
+                /** @description Page number, from 1 */
+                page?: number;
+                /** @description Items per page (at most 100) */
+                limit?: number;
+                /** @description Search the title */
+                q?: string;
+                /** @description A campus id or slug (its events plus church-wide ones), or 'all' for church-wide events only */
+                campus?: string;
+                /** @description A series slug */
+                series?: string;
+            };
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            id: string;
+                            title: string;
+                            /** Format: date-time */
+                            startDate: string;
+                            /** Format: date-time */
+                            endDate: string;
+                            location: string | null;
+                            /** @description The headline price in rand (0 = free) */
+                            price: number;
+                            pictureUrl: string | null;
+                            requiresRegistration: boolean;
+                            /** @enum {string} */
+                            scheduleType: "single" | "sessions";
+                            /** @description null = for all campuses (or campuses are off) */
+                            campus: {
+                                id: string;
+                                name: string;
+                                slug: string;
+                            } | null;
+                            series: {
+                                id: string;
+                                name: string;
+                                slug: string;
+                            } | null;
+                        }[];
+                        meta: {
+                            page: number;
+                            limit: number;
+                            /** @description Items across all pages */
+                            total: number;
+                            /** @description Number of pages (at least 1) */
+                            pages: number;
+                        };
+                    };
+                };
+            };
+            /** @description Validation failed (VALIDATION_FAILED) */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+    getEventsId: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                /** @description The id */
+                id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            id: string;
+                            title: string;
+                            /** Format: date-time */
+                            startDate: string;
+                            /** Format: date-time */
+                            endDate: string;
+                            location: string | null;
+                            /** @description The headline price in rand (0 = free) */
+                            price: number;
+                            pictureUrl: string | null;
+                            requiresRegistration: boolean;
+                            /** @enum {string} */
+                            scheduleType: "single" | "sessions";
+                            /** @description null = for all campuses (or campuses are off) */
+                            campus: {
+                                id: string;
+                                name: string;
+                                slug: string;
+                            } | null;
+                            series: {
+                                id: string;
+                                name: string;
+                                slug: string;
+                            } | null;
+                            description: string | null;
+                            registrationDeadline: string | null;
+                            ticketOptions: {
+                                id: string;
+                                name: string;
+                                /** @description The normal price in rand */
+                                price: number;
+                                /** @description What it costs now (an early-bird price while one runs) */
+                                currentPrice: number;
+                                isMainTicket: boolean;
+                                /**
+                                 * @description "pick" = the buyer chooses sessions
+                                 * @enum {string}
+                                 */
+                                sessionMode: "all" | "pick";
+                            }[];
+                            /** @description Multi-day events only; empty otherwise */
+                            sessions: {
+                                id: string;
+                                label: string | null;
+                                /** Format: date-time */
+                                startsAt: string;
+                                /** Format: date-time */
+                                endsAt: string;
+                                location: string | null;
+                                cancelled: boolean;
+                            }[];
+                        };
+                    };
+                };
+            };
+            /** @description Validation failed (VALIDATION_FAILED) */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not found (NOT_FOUND) */
+            404: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+    postRegistrations: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody: {
+            content: {
+                "application/json": {
+                    eventId: string;
+                    options: {
+                        eventOptionId: string;
+                        quantity: number;
+                        variantId?: string | null;
+                        /** @description "Pick sessions" tickets: the sessions chosen */
+                        sessionIds?: string[];
+                    }[];
+                    guest?: {
+                        name: string;
+                        /** Format: email */
+                        email: string;
+                        phone?: string;
+                    };
+                    couponCode?: string;
+                    /** @description Names for the places (events that collect them) */
+                    attendees?: {
+                        eventOptionId: string;
+                        variantId?: string | null;
+                        name: string;
+                        email?: string | null;
+                        phone?: string | null;
+                        /** @description YYYY-MM-DD (youth events) */
+                        dateOfBirth?: string | null;
+                        gender?: string | null;
+                        parentName?: string | null;
+                        parentEmail?: string | null;
+                        parentPhone?: string | null;
+                    }[];
+                    /**
+                     * @description With attendees: tickets to the payer, or to each attendee
+                     * @enum {string}
+                     */
+                    ticketDelivery?: "payer" | "each";
+                    waitlistToken?: string;
+                    analyticsSessionId?: string;
+                };
+            };
+        };
+        responses: {
+            /** @description OK */
+            201: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            id: string;
+                            /** @enum {string} */
+                            status: "pending" | "confirmed" | "partial_paid" | "paid" | "cancelled";
+                            /** Format: date-time */
+                            createdAt: string;
+                            event: {
+                                id: string;
+                                title: string;
+                                /** Format: date-time */
+                                startDate: string;
+                                /** Format: date-time */
+                                endDate: string;
+                            };
+                            items: {
+                                ticket: string;
+                                variant: string | null;
+                                quantity: number;
+                                unitPrice: number;
+                            }[];
+                            /** @description In rand, after discounts */
+                            totalDue: number;
+                            /** @description In rand (refunds subtracted) */
+                            amountPaid: number;
+                            /** @description totalDue − amountPaid; 0 or less = nothing owing */
+                            balance: number;
+                            /** @description false = added to an existing registration */
+                            isNew: boolean;
+                            couponError: string | null;
+                        };
+                    };
+                };
+            };
+            /** @description Validation failed (VALIDATION_FAILED) */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+    getRegistrationsId: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                /** @description The id */
+                id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            id: string;
+                            /** @enum {string} */
+                            status: "pending" | "confirmed" | "partial_paid" | "paid" | "cancelled";
+                            /** Format: date-time */
+                            createdAt: string;
+                            event: {
+                                id: string;
+                                title: string;
+                                /** Format: date-time */
+                                startDate: string;
+                                /** Format: date-time */
+                                endDate: string;
+                            };
+                            items: {
+                                ticket: string;
+                                variant: string | null;
+                                quantity: number;
+                                unitPrice: number;
+                            }[];
+                            /** @description In rand, after discounts */
+                            totalDue: number;
+                            /** @description In rand (refunds subtracted) */
+                            amountPaid: number;
+                            /** @description totalDue − amountPaid; 0 or less = nothing owing */
+                            balance: number;
+                        };
+                    };
+                };
+            };
+            /** @description Validation failed (VALIDATION_FAILED) */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not signed in (UNAUTHENTICATED) */
+            401: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not found (NOT_FOUND) */
+            404: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+    postRegistrationsIdCancel: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                /** @description The id */
+                id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            id: string;
+                            /** @enum {string} */
+                            status: "pending" | "confirmed" | "partial_paid" | "paid" | "cancelled";
+                            /** Format: date-time */
+                            createdAt: string;
+                            event: {
+                                id: string;
+                                title: string;
+                                /** Format: date-time */
+                                startDate: string;
+                                /** Format: date-time */
+                                endDate: string;
+                            };
+                            items: {
+                                ticket: string;
+                                variant: string | null;
+                                quantity: number;
+                                unitPrice: number;
+                            }[];
+                            /** @description In rand, after discounts */
+                            totalDue: number;
+                            /** @description In rand (refunds subtracted) */
+                            amountPaid: number;
+                            /** @description totalDue − amountPaid; 0 or less = nothing owing */
+                            balance: number;
+                        };
+                    };
+                };
+            };
+            /** @description Validation failed (VALIDATION_FAILED) */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not signed in (UNAUTHENTICATED) */
+            401: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not found (NOT_FOUND) */
+            404: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+    postRegistrationsIdCheckout: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                /** @description The id */
+                id: string;
+            };
+            cookie?: never;
+        };
+        requestBody: {
+            content: {
+                "application/json": {
+                    /** @description An optional donation added on top, in rand */
+                    donationAmount?: number;
+                    /** @description yoco or payfast (default: the first one switched on) */
+                    provider?: string;
+                    /** Format: uri */
+                    successUrl?: string;
+                    /** Format: uri */
+                    cancelUrl?: string;
+                    /** Format: uri */
+                    failureUrl?: string;
+                };
+            };
+        };
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            /** @constant */
+                            priceUpdated: true;
+                            newBalance: number;
+                            message: string;
+                        } | {
+                            /** @constant */
+                            priceUpdated: false;
+                            checkoutId: string;
+                            redirectUrl: string;
+                            provider: string;
+                            /** @description Charged now, in rand (with any donation) */
+                            amount: number;
+                        };
+                    };
+                };
+            };
+            /** @description Validation failed (VALIDATION_FAILED) */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not signed in (UNAUTHENTICATED) */
+            401: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not found (NOT_FOUND) */
+            404: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+    getMe: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            id: string;
+                            name: string;
+                            email: string;
+                            phone: string | null;
+                            /** @enum {string} */
+                            role: "admin" | "supervisor" | "staff" | "user";
+                            twoFactorEnabled: boolean;
+                            /** Format: date-time */
+                            createdAt: string;
+                        };
+                    };
+                };
+            };
+            /** @description Not signed in (UNAUTHENTICATED) */
+            401: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+    getMeRegistrations: {
+        parameters: {
+            query?: {
+                /** @description Page number, from 1 */
+                page?: number;
+                /** @description Items per page (at most 100) */
+                limit?: number;
+                /** @description Include past and cancelled registrations */
+                past?: "true" | "false";
+            };
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": {
+                        data: {
+                            id: string;
+                            /** @enum {string} */
+                            status: "pending" | "confirmed" | "partial_paid" | "paid" | "cancelled";
+                            /** Format: date-time */
+                            createdAt: string;
+                            event: {
+                                id: string;
+                                title: string;
+                                /** Format: date-time */
+                                startDate: string;
+                                /** Format: date-time */
+                                endDate: string;
+                            };
+                            items: {
+                                ticket: string;
+                                variant: string | null;
+                                quantity: number;
+                                unitPrice: number;
+                            }[];
+                            /** @description In rand, after discounts */
+                            totalDue: number;
+                            /** @description In rand (refunds subtracted) */
+                            amountPaid: number;
+                            /** @description totalDue − amountPaid; 0 or less = nothing owing */
+                            balance: number;
+                        }[];
+                        meta: {
+                            page: number;
+                            limit: number;
+                            /** @description Items across all pages */
+                            total: number;
+                            /** @description Number of pages (at least 1) */
+                            pages: number;
+                        };
+                    };
+                };
+            };
+            /** @description Validation failed (VALIDATION_FAILED) */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+            /** @description Not signed in (UNAUTHENTICATED) */
+            401: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
+        };
+    };
+}

frontend/src/lib/api.ts

@@ -74,8 +74,9 @@ export function resolveToApiOrigin(urlOrPath: string | null | undefined): string
   return API_BASE ? `${API_BASE}${raw}` : raw;
 }
 
-// The parsed JSON body of a failed request — the backend always sends `message`, and
-// some routes add a machine-readable `code` or extra detail fields.
+// The parsed JSON body of a failed request — v1 sends `message` (some routes add a
+// machine-readable `code` or extra detail fields); for v2 it is the `error` object
+// (`code`, `message`, and `fields` on validation errors).
 export type ApiErrorData = { message?: string; code?: string; [key: string]: unknown };
 
 export class ApiError extends Error {
@@ -122,6 +123,11 @@ export async function apiFetch<T = unknown>(path: string, options: ApiOptions =
       const json = JSON.parse(text);
       if (json?.message && typeof json.message === "string") message = json.message;
       data = json;
+      // /api/v2 errors: { error: { code, message, fields? } }
+      if (json?.error && typeof json.error === "object" && typeof json.error.message === "string") {
+        message = json.error.message;
+        data = { ...json.error };
+      }
     } catch { /* not JSON — use raw text */ }
     // An admin/supervisor session from before 2FA was required for their role:
     // end it and send them to log in, where they enrol.
@@ -198,21 +204,23 @@ export function fetchAllPayments(token: string, params: Record<string, string> =
   return fetchAllPages<Payment>("/api/payments", token, params);
 }
 
-// Creates an online checkout (default payment provider) for a registration's full remaining balance.
-// Omitting `amount` makes the backend charge the full remainder rather than a partial amount —
-// partial-amount checkouts are only ever created from the supervisor payments dashboard.
+// Starts an online payment for everything still owed on one of my registrations (API v2), with
+// an optional donation on top. Partial amounts are only taken from the supervisor payments page.
 export type CheckoutResponse = { redirectUrl?: string; priceUpdated?: boolean; newTotal?: number; message?: string };
 
-export function createFullPaymentCheckout(token: string, registrationId: string, donationAmount?: number): Promise<CheckoutResponse> {
-  return apiFetch<CheckoutResponse>("/api/payments/checkout", {
-    method: "POST",
+export async function createFullPaymentCheckout(token: string, registrationId: string, donationAmount?: number): Promise<CheckoutResponse> {
+  const { apiV2 } = await import("@/lib/apiV2");
+  const { data } = await apiV2("post", "/registrations/{id}/checkout", {
+    params: { id: registrationId },
     authToken: token,
     body: {
-      registrationId,
       ...(donationAmount && donationAmount > 0 ? { donationAmount } : {}),
       successUrl: window.location.origin + "/payment/success",
       cancelUrl: window.location.origin + "/payment/cancel",
       failureUrl: window.location.origin + "/payment/failure",
     },
   });
+  // The price changed since registering: nothing was started — show the new amount owing.
+  if (data.priceUpdated) return { priceUpdated: true, newTotal: data.newBalance, message: data.message };
+  return { redirectUrl: data.redirectUrl };
 }

frontend/src/lib/apiV2.ts

@@ -0,0 +1,44 @@
+import { apiFetch } from "@/lib/api";
+import type { paths } from "@/lib/api-v2/schema";
+
+/**
+ * Typed calls to /api/v2. The types come from the backend's OpenAPI document
+ * (`npm run api:types` in the repo root regenerates src/lib/api-v2/), so a path, its parameters,
+ * its body and its answer are all checked by TypeScript:
+ *
+ *   const { data, meta } = await apiV2("get", "/events", { query: { q: "camp", limit: 10 } });
+ *   const { data } = await apiV2("post", "/registrations/{id}/cancel", { params: { id }, authToken });
+ *
+ * Errors throw ApiError (from apiFetch) with the v2 `code` and `fields` in `.data`.
+ */
+
+type Method = "get" | "post" | "put" | "patch" | "delete";
+type PathsWith<M extends Method> = { [P in keyof paths]: paths[P][M] extends { responses: unknown } ? P : never }[keyof paths];
+type Op<P extends keyof paths, M extends Method> = NonNullable<paths[P][M]>;
+
+type Json<T> = T extends { content: { "application/json": infer J } } ? J : never;
+type Responses<O> = O extends { responses: infer R } ? R : never;
+/** The 2xx answer's JSON. */
+export type V2Result<P extends keyof paths, M extends Method> = Json<Responses<Op<P, M>>[Extract<keyof Responses<Op<P, M>>, 200 | 201>]>;
+
+type PathParams<O> = O extends { parameters: { path: infer X } } ? (X extends Record<string, unknown> ? X : never) : never;
+type QueryParams<O> = O extends { parameters: { query?: infer X } } ? X : never;
+type Body<O> = O extends { requestBody: { content: { "application/json": infer B } } } ? B : never;
+
+type IfAny<T, Then> = [T] extends [never] ? object : Then;
+export type V2Options<P extends keyof paths, M extends Method> =
+  { authToken?: string | null }
+  & IfAny<PathParams<Op<P, M>>, { params: PathParams<Op<P, M>> }>
+  & IfAny<QueryParams<Op<P, M>>, { query?: QueryParams<Op<P, M>> }>
+  & IfAny<Body<Op<P, M>>, { body: Body<Op<P, M>> }>;
+
+export function apiV2<M extends Method, P extends PathsWith<M>>(method: M, path: P, ...[options]: object extends V2Options<P, M> ? [V2Options<P, M>?] : [V2Options<P, M>]): Promise<V2Result<P, M>> {
+  const opts = (options || {}) as { authToken?: string | null; params?: Record<string, string>; query?: Record<string, unknown>; body?: unknown };
+  let url = String(path).replace(/\{(\w+)\}/g, (_, name: string) => encodeURIComponent(String(opts.params?.[name] ?? "")));
+  const qs = new URLSearchParams();
+  for (const [k, v] of Object.entries(opts.query || {})) {
+    if (v !== undefined && v !== null && v !== "") qs.set(k, String(v));
+  }
+  if (qs.toString()) url += `?${qs.toString()}`;
+  return apiFetch<V2Result<P, M>>(`/api/v2${url}`, { method: method.toUpperCase(), authToken: opts.authToken, body: opts.body });
+}

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "hope-events",
-  "version": "1.51.0",
+  "version": "1.51.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "hope-events",
-      "version": "1.51.0",
+      "version": "1.51.1",
       "license": "ISC",
       "devDependencies": {
         "@axe-core/playwright": "^4.14.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hope-events",
-  "version": "1.51.0",
+  "version": "1.51.1",
   "main": "index.js",
   "scripts": {
     "dev:backend": "cd backend && npm run dev",
@@ -16,7 +16,8 @@
     "demo:small": "npm --prefix backend run set-demo -- --profile=small",
     "demo:events": "npm --prefix backend run set-demo -- --profile=events",
     "demo:ministry": "npm --prefix backend run set-demo -- --profile=ministry",
-    "demo:multicampus": "npm --prefix backend run set-demo -- --profile=multicampus"
+    "demo:multicampus": "npm --prefix backend run set-demo -- --profile=multicampus",
+    "api:types": "npm --prefix backend run openapi && npm --prefix frontend run api:types"
   },
   "keywords": [],
   "author": "",