DC-057: close checkout-to-license contract drift (grade B)

Canonical product catalog at src/billing/catalog.js shared by Stripe
Checkout client (src/billing/stripe-client.js), webhook bridge
(scripts/stripe-license-bridge.js), and pricing page
(status/pricing/index.html). One-time payment keyed by productId at
$20/$50/$70/$99 — no more monthly/annual subscription drift.

Bridge resolves duration via metadata.productId (single contract),
requires payment_status === 'paid' before fulfillment (rejects
unpaid/no_payment_required/missing with ack 200), handles
async_payment_succeeded for ACH/SEPA delayed-payment flow. License
persisted to fulfillment-store BEFORE email — SMTP failure path serves
the persisted code via the new /api/v1/billing/lookup/:sessionId
endpoint (the documented customer recovery path).

Layer-1 (event-id) + layer-2 (session-id) idempotency prevent
duplicate issuance. Checkout return URLs derived from
STRIPE_PUBLIC_ORIGIN or STRIPE_ALLOWED_HOSTS (not raw Host header) —
closes host-header-poisoning + session-ID-leak attack class.

1498/1498 Jest tests pass (62 suites), zero new ESLint warnings
introduced. Test files:
  - stripe-license-bridge.test.js (24 tests)
  - billing-lookup.test.js (8 tests, HTTP-level)
  - bridge-lookup-http.test.js (5 tests, uses exported createServer)
  - pricing-page-catalog.test.js (9 tests, per-tier consistency)
  - checkout-origin.test.js (6 tests, host injection rejection)
  - stripe-client.test.js (rewrite for productId + mode:payment)

Bridge code refactored: handleWebhook decomposed into verifySignature +
parseEventBody + checkEventIdempotency + fulfillCheckout +
ensureLicensePersisted (under ESLint complexity=20 cap). New
createServer()/createRequestHandler() factories guarded by
require.main === module.

Removed 3 stale test files from the rolled-back DC-055 attempt.

dashcaddy-api/__tests__/billing/billing-lookup.test.js

@@ -0,0 +1,172 @@
+/**
+ * DC-057 billing lookup endpoint tests.
+ *
+ * Tests the GET /api/v1/billing/lookup/:sessionId route handler with a
+ * real fulfillment store on disk. Covers:
+ *
+ *   - 404 for unknown sessionId
+ *   - processing state (record exists, no code yet)
+ *   - pending_email state — license persisted, email failed (SMTP recovery path)
+ *   - delivered state
+ *   - 404 past the 24h TTL
+ *   - Cache-Control: no-store on all responses
+ *   - Parameterized PUBLIC_ROUTES entry exists for this path
+ */
+
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const crypto = require('crypto');
+const express = require('express');
+
+const TMP = fs.mkdtempSync(path.join(os.tmpdir(), 'dc057-lookup-'));
+process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE = path.join(TMP, 'stripe-fulfillments.json');
+
+const billingRoutes = require('../../routes/billing');
+const { createFulfillmentStore } = require('../../src/billing/fulfillment-store');
+
+function makeApp() {
+  const app = express();
+  // Mock asyncHandler that calls the inner fn synchronously.
+  function asyncHandler(fn) {
+    return (req, res, next) => {
+      Promise.resolve(fn(req, res, next)).catch(next);
+    };
+  }
+  const router = billingRoutes({ asyncHandler });
+  app.use('/api/v1/billing', router);
+  return app;
+}
+
+function seedRecord(sessionId, overrides = {}) {
+  const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+  // Plant a record directly via the mutation API.
+  return store.claim({
+    eventId: overrides.eventId || 'evt_seed',
+    sessionId,
+    productId: overrides.productId || 'pro-30d',
+    durationDays: overrides.durationDays || 30,
+    email: overrides.email || 'alice@example.com',
+  });
+}
+
+describe('GET /api/v1/billing/lookup/:sessionId', () => {
+  let app;
+  beforeAll(() => {
+    app = makeApp();
+  });
+
+  function get(sessionId) {
+    return new Promise((resolve, reject) => {
+      const server = app.listen(0, () => {
+        const port = server.address().port;
+        const http = require('http');
+        http.get(`http://127.0.0.1:${port}/api/v1/billing/lookup/${encodeURIComponent(sessionId)}`, (res) => {
+          let body = '';
+          res.on('data', (c) => { body += c; });
+          res.on('end', () => {
+            server.close();
+            resolve({ status: res.statusCode, headers: res.headers, body: body ? JSON.parse(body) : null });
+          });
+        }).on('error', reject);
+      });
+    });
+  }
+
+  test('returns 404 for unknown sessionId', async () => {
+    const res = await get('cs_unknown_session');
+    expect(res.status).toBe(404);
+    expect(res.body).toMatchObject({ success: false });
+    expect(res.headers['cache-control']).toBe('no-store');
+  });
+
+  test('returns 400 for invalid sessionId (too long)', async () => {
+    const longId = 'x'.repeat(300);
+    const res = await get(longId);
+    expect(res.status).toBe(400);
+    expect(res.headers['cache-control']).toBe('no-store');
+  });
+
+  test('returns processing state when record has no code yet', async () => {
+    const sessionId = `cs_proc_${crypto.randomBytes(4).toString('hex')}`;
+    await seedRecord(sessionId);
+
+    const res = await get(sessionId);
+    expect(res.status).toBe(200);
+    expect(res.body.success).toBe(true);
+    expect(res.body.data).toMatchObject({ status: 'processing', durationDays: 30, productId: 'pro-30d' });
+    expect(res.headers['cache-control']).toBe('no-store');
+  });
+
+  test('returns pending_email state with the persisted code (SMTP recovery)', async () => {
+    const sessionId = `cs_pending_${crypto.randomBytes(4).toString('hex')}`;
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    await store.claim({ eventId: 'evt_1', sessionId, productId: 'pro-90d', durationDays: 90, email: 'a@b.c' });
+    await store.saveLicense({ eventId: 'evt_1', sessionId, code: 'DC-TEST-CODE-90D', codeId: 'cid_1' });
+    await store.claimDelivery({ sessionId, ownerToken: 'evt_1' });
+    await store.markDeliveryFailed({ sessionId, ownerToken: 'evt_1', error: 'smtp-down' });
+
+    const res = await get(sessionId);
+    expect(res.status).toBe(200);
+    expect(res.body.data).toMatchObject({
+      status: 'pending_email',
+      durationDays: 90,
+      productId: 'pro-90d',
+      code: 'DC-TEST-CODE-90D',
+      codeId: 'cid_1',
+    });
+    expect(res.body.data.lastError).toMatch(/smtp-down/);
+  });
+
+  test('returns delivered state with the code + deliveredVia', async () => {
+    const sessionId = `cs_delivered_${crypto.randomBytes(4).toString('hex')}`;
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    await store.claim({ eventId: 'evt_2', sessionId, productId: 'pro-365d', durationDays: 365, email: 'a@b.c' });
+    await store.saveLicense({ eventId: 'evt_2', sessionId, code: 'DC-TEST-CODE-365D', codeId: 'cid_2' });
+    await store.claimDelivery({ sessionId, ownerToken: 'evt_2' });
+    await store.markDelivered({ sessionId, ownerToken: 'evt_2', deliveredVia: 'smtp' });
+
+    const res = await get(sessionId);
+    expect(res.status).toBe(200);
+    expect(res.body.data).toMatchObject({
+      status: 'delivered',
+      durationDays: 365,
+      productId: 'pro-365d',
+      code: 'DC-TEST-CODE-365D',
+      codeId: 'cid_2',
+      deliveredVia: 'smtp',
+    });
+  });
+
+  test('returns 404 past the 24h TTL', async () => {
+    const sessionId = `cs_old_${crypto.randomBytes(4).toString('hex')}`;
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    await store.claim({ eventId: 'evt_old', sessionId, productId: 'pro-30d', durationDays: 30, email: 'a@b.c' });
+    await store.saveLicense({ eventId: 'evt_old', sessionId, code: 'DC-OLD', codeId: 'cid_old' });
+    await store.markDelivered({ sessionId, ownerToken: 'evt_old', deliveredVia: 'smtp' });
+
+    // Manually backdate the record's createdAt to be older than 24h.
+    const fs = require('fs');
+    const file = process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE;
+    const state = JSON.parse(fs.readFileSync(file, 'utf8'));
+    const r = state.bySessionId[sessionId];
+    r.createdAt = new Date(Date.now() - 25 * 60 * 60 * 1000).toISOString();
+    fs.writeFileSync(file, JSON.stringify(state, null, 2));
+
+    const res = await get(sessionId);
+    expect(res.status).toBe(404);
+  });
+});
+
+describe('PUBLIC_ROUTES + CSRF allowlist for billing/lookup', () => {
+  const fs = require('fs');
+  test('PUBLIC_ROUTES includes /api/v1/billing/lookup/:sessionId', () => {
+    const content = fs.readFileSync(path.join(__dirname, '..', '..', 'src', 'utilities', 'middleware.js'), 'utf8');
+    expect(content).toMatch(/path:\s*['"]\/api\/v1\/billing\/lookup\/:sessionId['"]/);
+  });
+
+  test('CSRF excludedPaths includes /api/v1/billing/lookup/:sessionId', () => {
+    const content = fs.readFileSync(path.join(__dirname, '..', '..', 'src', 'security', 'csrf-protection.js'), 'utf8');
+    expect(content).toMatch(/['"]\/api\/v1\/billing\/lookup\/:sessionId['"]/);
+  });
+});

dashcaddy-api/__tests__/billing/bridge-lookup-http.test.js

@@ -0,0 +1,158 @@
+/**
+ * DC-057 bridge HTTP /lookup/:sessionId endpoint tests.
+ *
+ * Tests the bridge's own GET /lookup/:sessionId endpoint (separate from
+ * the API route). The bridge endpoint is for out-of-band operator use —
+ * the production customer lookup goes through routes/billing.js (covered
+ * by billing-lookup.test.js). But the bridge must still serve /lookup/*
+ * correctly for operator workflows and incident recovery.
+ */
+
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const http = require('http');
+const crypto = require('crypto');
+
+const TMP = fs.mkdtempSync(path.join(os.tmpdir(), 'dc057-bridge-http-'));
+process.env.STRIPE_BRIDGE_STATE_DIR = TMP;
+process.env.STRIPE_BRIDGE_EVENTS_FILE = path.join(TMP, 'stripe-events.json');
+process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE = path.join(TMP, 'stripe-fulfillments.json');
+process.env.STRIPE_WEBHOOK_SECRET = 'whsec_test_' + crypto.randomBytes(8).toString('hex');
+delete process.env.SMTP_HOST;
+delete process.env.SMTP_FROM;
+
+jest.mock('../../license-keygen', () => {
+  // Use the built-in Date + Math.random instead of crypto so the jest.mock
+  // factory stays in scope (jest.mock factory bodies cannot reference
+  // outer-scope identifiers like `crypto`).
+  const mockRandom = () => Math.random().toString(16).slice(2, 10).toUpperCase();
+  let mockCounter = 0;
+  return {
+    VALID_DURATIONS: [30, 90, 180, 365],
+    loadSecret: () => 'mock-secret',
+    generateCodes: jest.fn(({ durationDays, count }) => {
+      const codes = [];
+      for (let i = 0; i < count; i++) {
+        codes.push({
+          code: `DC-TEST-${durationDays}D-${mockRandom()}`,
+          codeId: `cid_${Date.now()}_${i}_${++mockCounter}`,
+        });
+      }
+      return codes;
+    }),
+  };
+});
+jest.mock('nodemailer', () => ({
+  createTransport: () => ({ sendMail: jest.fn() }),
+}));
+
+const { createFulfillmentStore } = require('../../src/billing/fulfillment-store');
+const bridge = require('../../scripts/stripe-license-bridge');
+
+let server;
+let port;
+
+beforeAll((done) => {
+  // Use the bridge's own createServer() factory so the test exercises the
+  // SAME request dispatcher the production server uses (no duplicated
+  // route decoding / status mapping in test code).
+  server = bridge.createServer();
+  server.listen(0, () => {
+    port = server.address().port;
+    done();
+  });
+});
+
+afterAll((done) => {
+  server.close(done);
+});
+
+function get(path) {
+  return new Promise((resolve, reject) => {
+    http.get(`http://127.0.0.1:${port}${path}`, (res) => {
+      let body = '';
+      res.on('data', (c) => { body += c; });
+      res.on('end', () => {
+        resolve({ status: res.statusCode, headers: res.headers, body: body ? JSON.parse(body) : null });
+      });
+    }).on('error', reject);
+  });
+}
+
+describe('bridge GET /lookup/:sessionId', () => {
+  test('returns 404 for unknown sessionId', async () => {
+    const res = await get('/lookup/cs_unknown_session');
+    expect(res.status).toBe(404);
+    expect(res.body).toEqual({ status: 'not_found' });
+    expect(res.headers['cache-control']).toBe('no-store');
+  });
+
+  test('returns 400 for malformed percent-encoded sessionId', async () => {
+    // %ZZ is not valid hex.
+    const res = await get('/lookup/cs_%ZZ_bad');
+    expect(res.status).toBe(400);
+    expect(res.body.reason).toBe('invalid-session-id');
+  });
+
+  test('returns delivered state with code + deliveredVia for planted record', async () => {
+    const sessionId = `cs_test_delivered_${crypto.randomBytes(4).toString('hex')}`;
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    await store.claim({ eventId: 'evt_1', sessionId, productId: 'pro-30d', durationDays: 30, email: 'a@b.c' });
+    await store.saveLicense({ eventId: 'evt_1', sessionId, code: 'DC-X', codeId: 'cid_1' });
+    await store.claimDelivery({ sessionId, ownerToken: 'evt_1' });
+    await store.markDelivered({ sessionId, ownerToken: 'evt_1', deliveredVia: 'smtp' });
+
+    const res = await get(`/lookup/${encodeURIComponent(sessionId)}`);
+    expect(res.status).toBe(200);
+    expect(res.body).toMatchObject({
+      status: 'delivered',
+      durationDays: 30,
+      productId: 'pro-30d',
+      code: 'DC-X',
+      codeId: 'cid_1',
+      deliveredVia: 'smtp',
+    });
+    expect(res.headers['cache-control']).toBe('no-store');
+  });
+
+  test('returns pending_email state (SMTP recovery)', async () => {
+    const sessionId = `cs_test_pending_${crypto.randomBytes(4).toString('hex')}`;
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    await store.claim({ eventId: 'evt_2', sessionId, productId: 'pro-90d', durationDays: 90, email: 'a@b.c' });
+    await store.saveLicense({ eventId: 'evt_2', sessionId, code: 'DC-Y', codeId: 'cid_2' });
+    await store.claimDelivery({ sessionId, ownerToken: 'evt_2' });
+    await store.markDeliveryFailed({ sessionId, ownerToken: 'evt_2', error: 'smtp-down' });
+
+    const res = await get(`/lookup/${encodeURIComponent(sessionId)}`);
+    expect(res.status).toBe(200);
+    expect(res.body).toMatchObject({
+      status: 'pending_email',
+      durationDays: 90,
+      productId: 'pro-90d',
+      code: 'DC-Y',
+      codeId: 'cid_2',
+    });
+    expect(res.body.lastError).toMatch(/smtp-down/);
+  });
+
+  test('returns 404 past the 24h TTL', async () => {
+    const sessionId = `cs_test_old_${crypto.randomBytes(4).toString('hex')}`;
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    await store.claim({ eventId: 'evt_3', sessionId, productId: 'pro-30d', durationDays: 30, email: 'a@b.c' });
+    await store.saveLicense({ eventId: 'evt_3', sessionId, code: 'DC-OLD', codeId: 'cid_3' });
+    await store.claimDelivery({ sessionId, ownerToken: 'evt_3' });
+    await store.markDelivered({ sessionId, ownerToken: 'evt_3', deliveredVia: 'smtp' });
+
+    // Backdate createdAt to be older than 24h.
+    const file = process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE;
+    const state = JSON.parse(fs.readFileSync(file, 'utf8'));
+    const r = state.bySessionId[sessionId];
+    r.createdAt = new Date(Date.now() - 25 * 60 * 60 * 1000).toISOString();
+    fs.writeFileSync(file, JSON.stringify(state, null, 2));
+
+    const res = await get(`/lookup/${encodeURIComponent(sessionId)}`);
+    expect(res.status).toBe(404);
+    expect(res.body).toEqual({ status: 'expired' });
+  });
+});

dashcaddy-api/__tests__/billing/checkout-origin.test.js

@@ -0,0 +1,227 @@
+/**
+ * DC-057 billing checkout origin resolution tests.
+ *
+ * The checkout endpoint embeds the success_url (and cancel_url) into the
+ * Stripe Checkout Session. These URLs are what Stripe redirects the
+ * customer's browser to after payment. They MUST be derived only from
+ * trusted sources — otherwise a header-injection attacker could redirect
+ * customers to their own origin and capture the session_id, which is
+ * the bearer token for /api/v1/billing/lookup/:sessionId (and that
+ * endpoint serves the customer's license code on success).
+ *
+ * The origin is resolved in this priority order:
+ *   1. STRIPE_PUBLIC_ORIGIN env var (canonical deployment shape)
+ *   2. Request Host header, but ONLY when the host is in
+ *      STRIPE_ALLOWED_HOSTS (operator-declared allowlist)
+ *   3. undefined (Stripe falls back to its own defaults)
+ */
+
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const express = require('express');
+const http = require('http');
+
+// Save the fulfillment-store path so the route module captures the same
+// path the route would in production. (Tests below exercise the
+// stripe-client, not the fulfillment store, so the lookup endpoint can
+// share the same file.)
+const TMP = fs.mkdtempSync(path.join(os.tmpdir(), 'dc057-origin-'));
+process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE = path.join(TMP, 'stripe-fulfillments.json');
+
+const billingRoutes = require('../../routes/billing');
+const stripeClient = require('../../src/billing/stripe-client');
+
+const REQUIRED_ENV = {
+  STRIPE_SECRET_KEY: '«redacted:sk_test_…»',
+  STRIPE_PRICE_PRO_30D: 'price_30d_test',
+  STRIPE_PRICE_PRO_90D: 'price_90d_test',
+  STRIPE_PRICE_PRO_180D: 'price_180d_test',
+  STRIPE_PRICE_PRO_365D: 'price_365d_test',
+};
+
+function setEnv(overrides = {}) {
+  const all = { ...REQUIRED_ENV, ...overrides };
+  for (const [k, v] of Object.entries(all)) {
+    process.env[k] = v;
+  }
+}
+function clearEnv() {
+  for (const k of Object.keys(REQUIRED_ENV)) delete process.env[k];
+  delete process.env.STRIPE_PUBLIC_ORIGIN;
+  delete process.env.STRIPE_ALLOWED_HOSTS;
+  delete process.env.NODE_ENV;
+}
+
+function makeApp() {
+  const app = express();
+  app.use(require('express').json());
+  function asyncHandler(fn) {
+    return (req, res, next) => {
+      Promise.resolve(fn(req, res, next)).catch(next);
+    };
+  }
+  const router = billingRoutes({ asyncHandler });
+  app.use('/api/v1/billing', router);
+  return app;
+}
+
+function postCheckout(req, body, headers = {}) {
+  return new Promise((resolve, reject) => {
+    const server = req.listen(0, () => {
+      const port = server.address().port;
+      const data = JSON.stringify(body);
+      const headerLines = Object.entries({ 'Content-Type': 'application/json', 'Content-Length': Buffer.byteLength(data), ...headers })
+        .map(([k, v]) => `${k}: ${v}`).join('\r\n');
+      const req2 = http.request({
+        hostname: '127.0.0.1', port, path: '/api/v1/billing/checkout', method: 'POST',
+        headers: Object.fromEntries(Object.entries({ 'Content-Type': 'application/json', 'Content-Length': Buffer.byteLength(data), ...headers }).map(([k, v]) => [k.toLowerCase(), v])),
+      }, (res) => {
+        let buf = '';
+        res.on('data', (c) => { buf += c; });
+        res.on('end', () => {
+          server.close();
+          resolve({ status: res.statusCode, headers: res.headers, body: buf ? JSON.parse(buf) : null });
+        });
+      });
+      req2.on('error', reject);
+      req2.write(data);
+      req2.end();
+    });
+  });
+}
+
+describe('POST /api/v1/billing/checkout — origin resolution (DC-057 security)', () => {
+  let app;
+  beforeAll(() => {
+    app = makeApp();
+    setEnv();
+  });
+  afterEach(() => {
+    clearEnv();
+    setEnv();
+    stripeClient._setStripeSdk(null);
+  });
+
+  test('uses STRIPE_PUBLIC_ORIGIN env var (canonical deployment shape)', async () => {
+    setEnv({ STRIPE_PUBLIC_ORIGIN: 'https://status.sami' });
+    const mockSession = { id: 'cs_test_orig_1', url: 'https://checkout.stripe.com/c/pay/cs_test_orig_1' };
+    let capturedParams;
+    stripeClient._setStripeSdk(jest.fn().mockReturnValue({
+      checkout: { sessions: { create: jest.fn().mockImplementation(async (params) => {
+        capturedParams = params;
+        return mockSession;
+      }) } },
+    }));
+
+    const res = await postCheckout(app, { productId: 'pro-30d' });
+    expect(res.status).toBe(200);
+    expect(res.body.success).toBe(true);
+    // The captured Stripe params must include the success_url + cancel_url
+    // built from the operator-declared origin — NOT from the request's Host
+    // header. This is the canonical deployment shape.
+    expect(capturedParams.success_url).toBe('https://status.sami/billing/success?session_id={CHECKOUT_SESSION_ID}');
+    expect(capturedParams.cancel_url).toBe('https://status.sami/pricing');
+  });
+
+  test('rejects Host header injection when STRIPE_ALLOWED_HOSTS is empty', async () => {
+    // Attacker sets X-Forwarded-Host: evil.com. The request reaches our
+    // endpoint. Without STRIPE_PUBLIC_ORIGIN + without STRIPE_ALLOWED_HOSTS,
+    // the origin must be undefined — we MUST NOT trust the attacker header.
+    setEnv({ STRIPE_ALLOWED_HOSTS: '' });
+    const mockSession = { id: 'cs_test_orig_2', url: 'https://checkout.stripe.com/c/pay/cs_test_orig_2' };
+    let capturedParams;
+    stripeClient._setStripeSdk(jest.fn().mockReturnValue({
+      checkout: { sessions: { create: jest.fn().mockImplementation(async (params) => {
+        capturedParams = params;
+        return mockSession;
+      }) } },
+    }));
+
+    const res = await postCheckout(app, { productId: 'pro-30d' }, {
+      'X-Forwarded-Host': 'evil.com',
+      'X-Forwarded-Proto': 'https',
+    });
+    expect(res.status).toBe(200);
+    // origin must be undefined when allowlist is empty — the Stripe SDK
+    // is called with undefined origin and the stripe-client falls back to
+    // relative '/billing/success' which is safe (no host poisoning).
+    expect(capturedParams.success_url).toMatch(/^\/billing\/success/);
+  });
+
+  test('accepts Host header when STRIPE_ALLOWED_HOSTS includes it', async () => {
+    setEnv({ STRIPE_ALLOWED_HOSTS: 'status.sami,dashcaddy.net' });
+    const mockSession = { id: 'cs_test_orig_3', url: 'https://checkout.stripe.com/c/pay/cs_test_orig_3' };
+    let capturedParams;
+    stripeClient._setStripeSdk(jest.fn().mockReturnValue({
+      checkout: { sessions: { create: jest.fn().mockImplementation(async (params) => {
+        capturedParams = params;
+        return mockSession;
+      }) } },
+    }));
+
+    const res = await postCheckout(app, { productId: 'pro-30d' }, {
+      'X-Forwarded-Host': 'status.sami',
+      'X-Forwarded-Proto': 'https',
+    });
+    expect(res.status).toBe(200);
+    expect(capturedParams.success_url).toContain('status.sami');
+    expect(capturedParams.success_url).toContain('/billing/success');
+  });
+
+  test('rejects Host header when host is NOT in STRIPE_ALLOWED_HOSTS', async () => {
+    setEnv({ STRIPE_ALLOWED_HOSTS: 'status.sami' });
+    const mockSession = { id: 'cs_test_orig_4', url: 'https://checkout.stripe.com/c/pay/cs_test_orig_4' };
+    let capturedParams;
+    stripeClient._setStripeSdk(jest.fn().mockReturnValue({
+      checkout: { sessions: { create: jest.fn().mockImplementation(async (params) => {
+        capturedParams = params;
+        return mockSession;
+      }) } },
+    }));
+
+    const res = await postCheckout(app, { productId: 'pro-30d' }, {
+      'X-Forwarded-Host': 'evil.com',
+      'X-Forwarded-Proto': 'https',
+    });
+    expect(res.status).toBe(200);
+    // origin is undefined → relative /billing/success URL (safe).
+    expect(capturedParams.success_url).toMatch(/^\/billing\/success/);
+    expect(capturedParams.success_url).not.toContain('evil.com');
+  });
+
+  test('rejects javascript: scheme injection via STRIPE_PUBLIC_ORIGIN', async () => {
+    setEnv({ STRIPE_PUBLIC_ORIGIN: 'javascript:alert(1)' });
+    const mockSession = { id: 'cs_test_orig_5', url: 'https://checkout.stripe.com/c/pay/cs_test_orig_5' };
+    let capturedParams;
+    stripeClient._setStripeSdk(jest.fn().mockReturnValue({
+      checkout: { sessions: { create: jest.fn().mockImplementation(async (params) => {
+        capturedParams = params;
+        return mockSession;
+      }) } },
+    }));
+
+    const res = await postCheckout(app, { productId: 'pro-30d' });
+    expect(res.status).toBe(200);
+    // javascript: scheme is rejected; origin falls through to header-based
+    // resolution, which is also gated by STRIPE_ALLOWED_HOSTS (empty here).
+    expect(capturedParams.success_url).not.toMatch(/javascript:/);
+  });
+
+  test('rejects http:// in production when NODE_ENV=production', async () => {
+    setEnv({ STRIPE_PUBLIC_ORIGIN: 'http://status.sami', NODE_ENV: 'production' });
+    const mockSession = { id: 'cs_test_orig_6', url: 'https://checkout.stripe.com/c/pay/cs_test_orig_6' };
+    let capturedParams;
+    stripeClient._setStripeSdk(jest.fn().mockReturnValue({
+      checkout: { sessions: { create: jest.fn().mockImplementation(async (params) => {
+        capturedParams = params;
+        return mockSession;
+      }) } },
+    }));
+
+    const res = await postCheckout(app, { productId: 'pro-30d' });
+    expect(res.status).toBe(200);
+    // http:// rejected in production; origin falls back to undefined.
+    expect(capturedParams.success_url).not.toMatch(/^http:/);
+  });
+});

dashcaddy-api/__tests__/billing/pricing-page-catalog.test.js

@@ -0,0 +1,134 @@
+/**
+ * DC-057 pricing-page catalog consistency test.
+ *
+ * The pricing page at status/pricing/index.html hard-codes the 4 product
+ * IDs, prices, and labels. This test asserts that those hard-coded values
+ * exactly match the catalog in src/billing/catalog.js — preventing drift
+ * between the two sources.
+ *
+ * If a new tier is added to the catalog, this test will fail until the
+ * pricing page is updated. If the pricing page is updated, the catalog
+ * must change in lockstep (or this test fails the other way).
+ */
+
+const fs = require('fs');
+const path = require('path');
+const catalog = require('../../src/billing/catalog');
+
+const PRICING_PAGE_PATH = path.join(__dirname, '..', '..', '..', 'status', 'pricing', 'index.html');
+
+function extractTiersFromPage(html) {
+  // Extract each `<div class="tier pro" data-product-id="...">` block, then
+  // pull out the dollar amount in the `<div class="price">` element and
+  // the durationDays from the "N-day Pro license" string. The regex is
+  // anchored on the tier-class open + the matching buy-btn close so we
+  // capture the full body of each tier card regardless of how many inner
+  // divs it has.
+  const tierRe = /<div class="tier pro" data-product-id="([^"]+)">([\s\S]*?)<button[^>]*class="buy-btn"[^>]*>\s*Buy/g;
+  const tierBlocks = [...html.matchAll(tierRe)];
+  return tierBlocks.map(([, productId, body]) => {
+    const priceMatch = body.match(/<div class="price">\$(\d+)<\/div>/);
+    const durMatch = body.match(/(\d+)-day Pro license/);
+    return {
+      productId,
+      priceDollars: priceMatch ? parseInt(priceMatch[1], 10) : null,
+      durationDays: durMatch ? parseInt(durMatch[1], 10) : null,
+    };
+  });
+}
+
+/**
+ * Extract the HTML body for one specific tier (from open div through the
+ * buy-btn). Used by per-tier assertions that must NOT bleed across cards.
+ */
+function extractTierBody(html, productId) {
+  const re = new RegExp(
+    `<div class="tier pro" data-product-id="${productId}">([\\s\\S]*?)<button[^>]*class="buy-btn"[^>]*>\\s*Buy`,
+    'i'
+  );
+  const m = html.match(re);
+  return m ? m[1] : null;
+}
+
+describe('pricing page <-> catalog consistency (DC-057)', () => {
+  let html;
+  let pageTiers;
+
+  beforeAll(() => {
+    html = fs.readFileSync(PRICING_PAGE_PATH, 'utf8');
+    pageTiers = extractTiersFromPage(html);
+  });
+
+  test('pricing page exists and is readable', () => {
+    expect(html.length).toBeGreaterThan(1000);
+    expect(pageTiers.length).toBeGreaterThan(0);
+  });
+
+  test('every catalog product is rendered on the pricing page', () => {
+    const catalogIds = catalog.PRODUCTS.map((p) => p.id).sort();
+    const pageIds = pageTiers.map((t) => t.productId).sort();
+    expect(pageIds).toEqual(catalogIds);
+  });
+
+  test('every pricing-page productId appears in the catalog', () => {
+    for (const tier of pageTiers) {
+      const product = catalog.getProduct(tier.productId);
+      expect(product).not.toBeNull();
+    }
+  });
+
+  test('pricing-page dollar amounts match catalog amountCents', () => {
+    for (const tier of pageTiers) {
+      const product = catalog.getProduct(tier.productId);
+      const expectedDollars = product.amountCents / 100;
+      expect(tier.priceDollars).toBe(expectedDollars);
+    }
+  });
+
+  test('pricing-page duration strings match catalog durationDays', () => {
+    for (const tier of pageTiers) {
+      const product = catalog.getProduct(tier.productId);
+      expect(tier.durationDays).toBe(product.durationDays);
+    }
+  });
+
+  test('catalog and pricing page agree on price label (scoped per tier card)', () => {
+    // Per-tier priceLabel assertion: each tier card must include its
+    // own catalog.priceLabel. A swap or misplaced label fails immediately
+    // because the assertion checks the tier's own HTML body, not the page.
+    for (const tier of pageTiers) {
+      const product = catalog.getProduct(tier.productId);
+      const body = extractTierBody(html, tier.productId);
+      expect(body).not.toBeNull();
+      // The priceLabel appears in the price div of THIS tier only,
+      // immediately followed by the closing </div> + the duration block.
+      const labelRegex = new RegExp(`<div class="price">\\s*\\${product.priceLabel}\\s*</div>\\s*<div class="duration"`);
+      expect(body).toMatch(labelRegex);
+    }
+  });
+
+  test('pricing page does not include the monthly/annual subscription toggle (one-time only)', () => {
+    // DC-057 acceptance: locked spec is ONE-TIME 30/90/180/365-day licenses
+    // at $20/$50/$70/$99. The old monthly/annual subscription toggle
+    // would contradict the spec.
+    expect(html).not.toMatch(/period-monthly|period-annual/);
+    expect(html).not.toMatch(/Subscribe to Pro/);
+  });
+
+  test('pricing page references the success-page endpoint', () => {
+    // The success URL is constructed server-side in stripe-client.js
+    // (${origin}/billing/success?session_id=...). The pricing page itself
+    // doesn't need to embed it — but the FOOTER must reference it so the
+    // customer knows where to go after Stripe redirects.
+    expect(html.toLowerCase()).toContain('after payment');
+    expect(html).toContain('/admin/license');
+    expect(html).toContain('/api/v1/billing/checkout');
+  });
+
+  test('success page (status/billing/success.html) exists and references the lookup endpoint', () => {
+    const successPath = path.join(__dirname, '..', '..', '..', 'status', 'billing', 'success.html');
+    const successHtml = fs.readFileSync(successPath, 'utf8');
+    expect(successHtml).toContain('/api/v1/billing/lookup/');
+    expect(successHtml.length).toBeGreaterThan(1000);
+  });
+});

dashcaddy-api/__tests__/billing/stripe-client.test.js

@@ -0,0 +1,234 @@
+/**
+ * DC-055 + DC-057 billing/stripe-client tests.
+ *
+ * Strategy: inject a mock Stripe SDK via _setStripeSdk so no real network
+ * calls ever happen. Cover the key behaviors of the one-time payment flow:
+ *
+ *  1. Configuration validation — missing STRIPE_SECRET_KEY fails loudly with 503.
+ *  2. productId validation — unknown productId returns 400 INVALID_PRODUCT_ID.
+ *  3. Product not configured — Stripe Price ID env var unset returns 503.
+ *  4. Happy path — creates a session with mode:payment + correct price ID + URLs.
+ *  5. Stripe SDK errors — surface as 502 to the customer, not 500.
+ *  6. Metadata contract — emits metadata.productId that the bridge can read back.
+ *  7. payment_intent_data — also carries productId metadata for downstream consumers.
+ *  8. Catalog drives everything — _resolveProduct reads the catalog, not env.
+ */
+
+const stripeClient = require('../../src/billing/stripe-client');
+const catalog = require('../../src/billing/catalog');
+
+const REQUIRED_ENV = {
+  STRIPE_SECRET_KEY: '«redacted:sk_test_…»',
+  STRIPE_PRICE_PRO_30D: 'price_30d_test',
+  STRIPE_PRICE_PRO_90D: 'price_90d_test',
+  STRIPE_PRICE_PRO_180D: 'price_180d_test',
+  STRIPE_PRICE_PRO_365D: 'price_365d_test',
+};
+
+function setEnv(overrides = {}) {
+  const all = { ...REQUIRED_ENV, ...overrides };
+  for (const [k, v] of Object.entries(all)) {
+    process.env[k] = v;
+  }
+}
+
+function clearEnv() {
+  for (const k of Object.keys(REQUIRED_ENV)) delete process.env[k];
+}
+
+function makeMockStripe(sessionsCreateImpl) {
+  const sessions = { create: jest.fn().mockImplementation(sessionsCreateImpl) };
+  return jest.fn().mockReturnValue({ checkout: { sessions } });
+}
+
+describe('billing/stripe-client', () => {
+  afterEach(() => {
+    clearEnv();
+    stripeClient._setStripeSdk(null);
+    jest.restoreAllMocks();
+  });
+
+  test('throws STRIPE_NOT_CONFIGURED when STRIPE_SECRET_KEY is missing', async () => {
+    setEnv({ STRIPE_SECRET_KEY: '' });
+    await expect(
+      stripeClient.createCheckoutSession({ productId: 'pro-30d', origin: 'https://status.sami' })
+    ).rejects.toMatchObject({
+      code: 'STRIPE_NOT_CONFIGURED',
+      statusCode: 503,
+      missing: expect.arrayContaining(['STRIPE_SECRET_KEY']),
+    });
+  });
+
+  test('throws STRIPE_NOT_CONFIGURED when 30d product Stripe Price ID is missing', async () => {
+    setEnv({ STRIPE_PRICE_PRO_30D: '' });
+    await expect(
+      stripeClient.createCheckoutSession({ productId: 'pro-30d', origin: 'https://status.sami' })
+    ).rejects.toMatchObject({
+      code: 'STRIPE_NOT_CONFIGURED',
+      missing: expect.arrayContaining(['STRIPE_PRICE_PRO_30D']),
+      productId: 'pro-30d',
+    });
+  });
+
+  test('throws INVALID_PRODUCT_ID when productId is missing', async () => {
+    setEnv();
+    await expect(
+      stripeClient.createCheckoutSession({ productId: '', origin: 'https://status.sami' })
+    ).rejects.toMatchObject({ code: 'INVALID_PRODUCT_ID', statusCode: 400, field: 'productId' });
+  });
+
+  test('throws INVALID_PRODUCT_ID when productId is unknown', async () => {
+    setEnv();
+    await expect(
+      stripeClient.createCheckoutSession({ productId: 'pro-1000d', origin: 'https://status.sami' })
+    ).rejects.toMatchObject({
+      code: 'INVALID_PRODUCT_ID',
+      statusCode: 400,
+      field: 'productId',
+    });
+  });
+
+  test('happy path: pro-30d creates session with mode=payment + correct params', async () => {
+    setEnv();
+    const mockSession = { id: 'cs_test_abc123', url: 'https://checkout.stripe.com/c/pay/cs_test_abc123' };
+    const mockStripe = makeMockStripe(async (params) => {
+      // DC-057: one-time payment, NOT subscription.
+      expect(params.mode).toBe('payment');
+      expect(params.line_items).toEqual([{ price: 'price_30d_test', quantity: 1 }]);
+      expect(params.success_url).toBe('https://status.sami/billing/success?session_id={CHECKOUT_SESSION_ID}');
+      expect(params.cancel_url).toBe('https://status.sami/pricing');
+      // The bridge reads this metadata back to map session → product → duration.
+      expect(params.metadata).toMatchObject({ productId: 'pro-30d', product: 'dashcaddy-pro' });
+      // payment_intent_data.metadata mirrors it for downstream Stripe→bridge consumers.
+      expect(params.payment_intent_data).toBeDefined();
+      expect(params.payment_intent_data.metadata).toMatchObject({ productId: 'pro-30d', product: 'dashcaddy-pro' });
+      // No subscription_data on one-time payment.
+      expect(params.subscription_data).toBeUndefined();
+      return mockSession;
+    });
+    stripeClient._setStripeSdk(mockStripe);
+
+    const result = await stripeClient.createCheckoutSession({
+      productId: 'pro-30d',
+      origin: 'https://status.sami',
+    });
+    expect(result).toEqual({ id: 'cs_test_abc123', url: mockSession.url });
+    expect(mockStripe).toHaveBeenCalledWith('«redacted:sk_test_…»');
+  });
+
+  test('happy path: pro-365d uses 365d price ID', async () => {
+    setEnv();
+    const mockStripe = makeMockStripe(async (params) => {
+      expect(params.line_items[0].price).toBe('price_365d_test');
+      expect(params.metadata.productId).toBe('pro-365d');
+      return { id: 'cs_365_xyz', url: 'https://checkout.stripe.com/c/pay/cs_365_xyz' };
+    });
+    stripeClient._setStripeSdk(mockStripe);
+
+    const result = await stripeClient.createCheckoutSession({
+      productId: 'pro-365d',
+      origin: 'https://status.sami',
+    });
+    expect(result.id).toBe('cs_365_xyz');
+  });
+
+  test('forwards customerEmail when provided', async () => {
+    setEnv();
+    const mockStripe = makeMockStripe(async (params) => {
+      expect(params.customer_email).toBe('alice@example.com');
+      return { id: 'cs_emailed', url: 'https://checkout.stripe.com/c/pay/cs_emailed' };
+    });
+    stripeClient._setStripeSdk(mockStripe);
+
+    await stripeClient.createCheckoutSession({
+      productId: 'pro-90d',
+      customerEmail: 'alice@example.com',
+      origin: 'https://status.sami',
+    });
+  });
+
+  test('omits customer_email when not provided (no undefined leakage to Stripe)', async () => {
+    setEnv();
+    const mockStripe = makeMockStripe(async (params) => {
+      expect('customer_email' in params).toBe(false);
+      return { id: 'cs_no_email', url: 'https://checkout.stripe.com/c/pay/cs_no_email' };
+    });
+    stripeClient._setStripeSdk(mockStripe);
+
+    await stripeClient.createCheckoutSession({
+      productId: 'pro-30d',
+      origin: 'https://status.sami',
+    });
+  });
+
+  test('uses STRIPE_SUCCESS_URL override when set', async () => {
+    setEnv({ STRIPE_SUCCESS_URL: 'https://custom.example.com/thanks' });
+    const mockStripe = makeMockStripe(async (params) => {
+      expect(params.success_url).toBe('https://custom.example.com/thanks');
+      return { id: 'cs_custom', url: 'x' };
+    });
+    stripeClient._setStripeSdk(mockStripe);
+
+    await stripeClient.createCheckoutSession({ productId: 'pro-30d', origin: 'https://status.sami' });
+  });
+
+  test('uses STRIPE_CANCEL_URL override when set', async () => {
+    setEnv({ STRIPE_CANCEL_URL: 'https://custom.example.com/back' });
+    const mockStripe = makeMockStripe(async (params) => {
+      expect(params.cancel_url).toBe('https://custom.example.com/back');
+      return { id: 'cs_cancel', url: 'x' };
+    });
+    stripeClient._setStripeSdk(mockStripe);
+
+    await stripeClient.createCheckoutSession({ productId: 'pro-30d', origin: 'https://status.sami' });
+  });
+
+  test('works with relative origin (no host header)', async () => {
+    setEnv();
+    const mockStripe = makeMockStripe(async () => ({ id: 'x', url: 'x' }));
+    stripeClient._setStripeSdk(mockStripe);
+
+    const result = await stripeClient.createCheckoutSession({ productId: 'pro-30d' });
+    expect(result.id).toBe('x');
+  });
+
+  test('each catalog product drives a different price ID', async () => {
+    setEnv();
+    for (const product of catalog.PRODUCTS) {
+      const mockStripe = makeMockStripe(async (params) => {
+        expect(params.line_items[0].price).toBe(REQUIRED_ENV[product.priceEnv]);
+        expect(params.metadata.productId).toBe(product.id);
+        return { id: `cs_${product.id}`, url: 'x' };
+      });
+      stripeClient._setStripeSdk(mockStripe);
+      await stripeClient.createCheckoutSession({ productId: product.id, origin: 'https://status.sami' });
+    }
+  });
+});
+
+describe('billing/stripe-client — _resolveProduct unit', () => {
+  test('resolves known productId with configured price', () => {
+    setEnv();
+    const result = stripeClient._resolveProduct('pro-30d');
+    expect(result.product.id).toBe('pro-30d');
+    expect(result.priceId).toBe('price_30d_test');
+  });
+
+  test('returns INVALID_PRODUCT_ID error for unknown productId', () => {
+    setEnv();
+    expect(() => stripeClient._resolveProduct('pro-1000d')).toThrow();
+    try { stripeClient._resolveProduct('pro-1000d'); } catch (e) {
+      expect(e.code).toBe('INVALID_PRODUCT_ID');
+      expect(e.statusCode).toBe(400);
+    }
+  });
+
+  test('returns STRIPE_NOT_CONFIGURED error when product price is unset', () => {
+    setEnv({ STRIPE_PRICE_PRO_180D: '' });
+    try { stripeClient._resolveProduct('pro-180d'); } catch (e) {
+      expect(e.code).toBe('STRIPE_NOT_CONFIGURED');
+      expect(e.statusCode).toBe(503);
+      expect(e.missing).toContain('STRIPE_PRICE_PRO_180D');
+    }
+  });
+});

dashcaddy-api/__tests__/billing/stripe-license-bridge.test.js

@@ -0,0 +1,522 @@
+/**
+ * DC-054 + DC-057 stripe-license-bridge tests.
+ *
+ * Strategy: no live network, no live Stripe SDK. We use `jest.mock` to
+ * substitute license-keygen + nodemailer before the bridge loads, drive
+ * handleWebhook() with crafted raw bodies + signatures.
+ *
+ * Coverage:
+ *   - Signature validation (pass / missing / wrong / out-of-tolerance)
+ *   - JSON parse failure
+ *   - Duplicate event-id → 200 idempotent
+ *   - Two different events for the SAME session → single license (layer-2 idempotency)
+ *   - License persisted BEFORE email (crash-safety)
+ *   - Email failure → markDeliveryFailed → returns 500 → customer can retrieve via lookup
+ *   - Retry from pending_email delivers the SAME code
+ *   - Concurrent lease (busy) returns 409
+ *   - Catalog resolution: missing productId → 400; unknown productId → 400;
+ *     product-not-configured → 400
+ *   - Lookup endpoint: not_found, processing, pending_email, delivered, expired TTL
+ *   - Layer-1 + Layer-2 idempotency under Stripe retry
+ */
+
+// jest.mock must be hoisted before any require.
+jest.mock('../../license-keygen', () => {
+  const crypto = require('crypto');
+  let calls = 0;
+  return {
+    VALID_DURATIONS: [30, 90, 180, 365],
+    loadSecret: () => 'mock-license-secret-' + crypto.randomBytes(8).toString('hex'),
+    generateCodes: jest.fn(({ durationDays, count }) => {
+      calls++;
+      const codes = [];
+      for (let i = 0; i < count; i++) {
+        codes.push({
+          code: `DC-TEST-${durationDays}D-${crypto.randomBytes(4).toString('hex').toUpperCase()}`,
+          codeId: `codeid_${Date.now()}_${i}_${calls}`,
+        });
+      }
+      return codes;
+    }),
+    __resetGenerateCalls() { calls = 0; },
+    __getGenerateCalls() { return calls; },
+  };
+});
+
+jest.mock('nodemailer', () => ({
+  createTransport: jest.fn(() => ({
+    sendMail: jest.fn(),
+  })),
+}));
+
+const path = require('path');
+const fs = require('fs');
+const os = require('os');
+const crypto = require('crypto');
+
+// Set up isolated tmp dirs BEFORE requiring the bridge (it captures paths at require time).
+const TMP = fs.mkdtempSync(path.join(os.tmpdir(), 'dc057-bridge-'));
+process.env.STRIPE_BRIDGE_STATE_DIR = TMP;
+process.env.STRIPE_BRIDGE_EVENTS_FILE = path.join(TMP, 'stripe-events.json');
+process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE = path.join(TMP, 'stripe-fulfillments.json');
+// Use a unique webhook secret so tests don't pollute each other.
+process.env.STRIPE_WEBHOOK_SECRET = 'whsec_test_' + crypto.randomBytes(8).toString('hex');
+// Configure all Stripe Prices so catalog.getConfiguredProducts() returns them.
+process.env.STRIPE_PRICE_PRO_30D = 'price_30d_test';
+process.env.STRIPE_PRICE_PRO_90D = 'price_90d_test';
+process.env.STRIPE_PRICE_PRO_180D = 'price_180d_test';
+process.env.STRIPE_PRICE_PRO_365D = 'price_365d_test';
+// Disable SMTP so the bridge falls back to dev-console unless a test
+// explicitly injects nodemailer.
+delete process.env.SMTP_HOST;
+delete process.env.SMTP_FROM;
+
+const licenseKeygenMock = require('../../license-keygen');
+const nodemailerMock = require('nodemailer');
+const bridge = require('../../scripts/stripe-license-bridge');
+const catalog = require('../../src/billing/catalog');
+const { createFulfillmentStore } = require('../../src/billing/fulfillment-store');
+
+afterEach(() => {
+  delete process.env.SMTP_HOST;
+  delete process.env.SMTP_FROM;
+  licenseKeygenMock.__resetGenerateCalls();
+  // Reset nodemailer.sendMail mock implementations between tests.
+  nodemailerMock.createTransport.mockClear();
+});
+
+// Helper: build a signed Stripe webhook payload.
+function buildSignedPayload(body, opts = {}) {
+  const secret = opts.secret || process.env.STRIPE_WEBHOOK_SECRET;
+  const ts = opts.timestamp || Math.floor(Date.now() / 1000);
+  const rawBody = Buffer.from(JSON.stringify(body));
+  const sig = crypto.createHmac('sha256', secret).update(`${ts}.${rawBody}`, 'utf8').digest('hex');
+  const header = `t=${ts},v1=${sig}`;
+  return { rawBody, signatureHeader: header };
+}
+
+function buildSessionEvent({ productId = 'pro-30d', sessionId, customerEmail = 'alice@example.com',
+                              eventId, lineItems, paymentStatus = 'paid' }) {
+  const product = catalog.getProduct(productId);
+  // For tests of "unknown productId" the catalog.getProduct returns null —
+  // we still build a valid event so the bridge can return its own 400.
+  const priceId = product ? catalog.getConfiguredPrice(product) : 'price_unconfigured';
+  return {
+    id: eventId || `evt_${crypto.randomBytes(6).toString('hex')}`,
+    type: 'checkout.session.completed',
+    data: {
+      object: {
+        id: sessionId || `cs_test_${crypto.randomBytes(6).toString('hex')}`,
+        customer_email: customerEmail,
+        customer_details: { email: customerEmail },
+        payment_status: paymentStatus,
+        amount_total: product ? product.amountCents : 0,
+        currency: 'usd',
+        metadata: { productId, product: 'dashcaddy-pro' },
+        line_items: { data: lineItems || [{ price: { id: priceId } }] },
+      },
+    },
+  };
+}
+
+function injectSmtp(impl) {
+  nodemailerMock.createTransport.mockImplementation(() => ({
+    sendMail: jest.fn().mockImplementation(impl),
+  }));
+}
+
+describe('stripe-license-bridge signature verification', () => {
+  test('rejects missing signature header', async () => {
+    const { rawBody } = buildSignedPayload({ id: 'evt_1', type: 'x' });
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader: '' });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toBe('signature-missing-signature');
+  });
+
+  test('rejects wrong signature', async () => {
+    const event = buildSessionEvent({ productId: 'pro-30d' });
+    const ts = Math.floor(Date.now() / 1000);
+    const rawBody = Buffer.from(JSON.stringify(event));
+    const sig = crypto.createHmac('sha256', 'wrong').update(`${ts}.${rawBody}`, 'utf8').digest('hex');
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader: `t=${ts},v1=${sig}` });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toMatch(/^signature-/);
+  });
+
+  test('rejects out-of-tolerance timestamp', async () => {
+    const event = buildSessionEvent({ productId: 'pro-30d' });
+    const oldTs = Math.floor(Date.now() / 1000) - 3600; // 1h ago, > 300s tolerance
+    const { rawBody, signatureHeader } = buildSignedPayload(event, { timestamp: oldTs });
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toBe('signature-timestamp-out-of-tolerance');
+  });
+});
+
+describe('stripe-license-bridge event parsing', () => {
+  test('rejects invalid JSON', async () => {
+    const rawBody = Buffer.from('not json');
+    const ts = Math.floor(Date.now() / 1000);
+    const sig = crypto.createHmac('sha256', process.env.STRIPE_WEBHOOK_SECRET).update(`${ts}.${rawBody}`, 'utf8').digest('hex');
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader: `t=${ts},v1=${sig}` });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toBe('invalid-json');
+  });
+
+  test('rejects event without id', async () => {
+    const event = { type: 'checkout.session.completed', data: { object: {} } };
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toBe('invalid-event');
+  });
+
+  test('acks unknown event types with 200 (so Stripe stops retrying)', async () => {
+    const event = { id: 'evt_unknown', type: 'customer.created', data: { object: {} } };
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(200);
+    expect(result.body.reason).toBe('ignored-event-type');
+  });
+});
+
+describe('stripe-license-bridge catalog resolution', () => {
+  test('rejects session without productId metadata', async () => {
+    const event = buildSessionEvent({ productId: 'pro-30d' });
+    delete event.data.object.metadata.productId;
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toBe('missing-productId');
+  });
+
+  test('rejects unknown productId', async () => {
+    const event = buildSessionEvent({ productId: 'pro-1000d' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toBe('unknown-productId');
+  });
+
+  test('rejects when product Stripe Price is unconfigured', async () => {
+    const productId = 'pro-30d';
+    const saved = process.env.STRIPE_PRICE_PRO_30D;
+    delete process.env.STRIPE_PRICE_PRO_30D;
+    try {
+      const event = buildSessionEvent({ productId });
+      const { rawBody, signatureHeader } = buildSignedPayload(event);
+      const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+      expect(result.status).toBe(400);
+      expect(result.body.reason).toBe('product-not-configured');
+    } finally {
+      process.env.STRIPE_PRICE_PRO_30D = saved;
+    }
+  });
+
+  test('rejects when customer email is missing', async () => {
+    const event = buildSessionEvent({ productId: 'pro-30d', customerEmail: '' });
+    delete event.data.object.customer_email;
+    delete event.data.object.customer_details.email;
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(400);
+    expect(result.body.reason).toBe('missing-customer-email');
+  });
+
+  test('accepts sessions without expanded line_items (Stripe webhook default)', async () => {
+    // DC-057 acceptance: Stripe does NOT expand line_items in webhooks by
+    // default — the bridge must accept the canonical metadata.productId
+    // even when line_items is absent. (Price verification, when added,
+    // should be an optional belt-and-suspenders via a separate API call,
+    // not a hard requirement.)
+    const event = buildSessionEvent({ productId: 'pro-30d' });
+    delete event.data.object.line_items;
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(200);
+    expect(result.body.delivered).toBe(true);
+    expect(result.body.productId).toBe('pro-30d');
+    expect(result.body.durationDays).toBe(30);
+  });
+
+  test('rejects unpaid sessions (no license until payment clears)', async () => {
+    // DC-057: a checkout.session.completed event with payment_status='unpaid'
+    // arrives when the customer closes the browser mid-checkout or for
+    // delayed-payment methods (ACH/SEPA) before they clear. The bridge
+    // MUST ack 200 (so Stripe stops retrying) but MUST NOT generate a
+    // license. The async_payment_succeeded event will fire later.
+    const event = buildSessionEvent({ productId: 'pro-30d', paymentStatus: 'unpaid' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(200);
+    expect(result.body.delivered).toBe(false);
+    expect(result.body.reason).toBe('payment-not-unpaid');
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(0);
+  });
+
+  test('rejects no_payment_required sessions (DashCaddy does not sell free products)', async () => {
+    // 'no_payment_required' is a Stripe-internal edge case for free
+    // sessions. DashCaddy has no $0 product, so reject explicitly.
+    const event = buildSessionEvent({ productId: 'pro-30d', paymentStatus: 'no_payment_required' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(200);
+    expect(result.body.delivered).toBe(false);
+    expect(result.body.reason).toBe('payment-not-no_payment_required');
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(0);
+  });
+
+  test('rejects sessions with missing payment_status', async () => {
+    const event = buildSessionEvent({ productId: 'pro-30d', paymentStatus: '' });
+    delete event.data.object.payment_status;
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(200);
+    expect(result.body.delivered).toBe(false);
+    expect(result.body.reason).toBe('payment-not-confirmed');
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(0);
+  });
+
+  test('fulfills async_payment_succeeded events for delayed-payment methods', async () => {
+    // ACH/SEPA: Stripe first sends checkout.session.completed (unpaid),
+    // then async_payment_succeeded (paid) when the bank clears. The
+    // bridge generates the license on the second event.
+    const sessionId = `cs_test_ach_${crypto.randomBytes(4).toString('hex')}`;
+    const event = {
+      id: `evt_ach_${crypto.randomBytes(6).toString('hex')}`,
+      type: 'checkout.session.async_payment_succeeded',
+      data: {
+        object: {
+          id: sessionId,
+          customer_email: 'alice@example.com',
+          customer_details: { email: 'alice@example.com' },
+          payment_status: 'paid',
+          amount_total: 5000,
+          currency: 'usd',
+          metadata: { productId: 'pro-90d', product: 'dashcaddy-pro' },
+        },
+      },
+    };
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(200);
+    expect(result.body.delivered).toBe(true);
+    expect(result.body.productId).toBe('pro-90d');
+    expect(result.body.durationDays).toBe(90);
+  });
+
+  test('acks async_payment_failed events without generating a license', async () => {
+    const event = {
+      id: `evt_ach_fail_${crypto.randomBytes(6).toString('hex')}`,
+      type: 'checkout.session.async_payment_failed',
+      data: {
+        object: {
+          id: `cs_test_fail_${crypto.randomBytes(6).toString('hex')}`,
+          payment_status: 'unpaid',
+        },
+      },
+    };
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(200);
+    expect(result.body.delivered).toBe(false);
+    expect(result.body.reason).toBe('async-payment-failed');
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(0);
+  });
+});
+
+describe('stripe-license-bridge happy path', () => {
+  test('generates + persists + delivers license (dev-console SMTP fallback)', async () => {
+    const event = buildSessionEvent({ productId: 'pro-90d' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+
+    expect(result.status).toBe(200);
+    expect(result.body.delivered).toBe(true);
+    expect(result.body.productId).toBe('pro-90d');
+    expect(result.body.durationDays).toBe(90);
+    expect(result.body.codeId).toBeTruthy();
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(1);
+
+    // Fulfillment record exists.
+    const record = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE })
+      .readBySession(event.data.object.id);
+    expect(record.status).toBe('delivered');
+    expect(record.code).toBeTruthy();
+    expect(record.codeId).toBe(result.body.codeId);
+    expect(record.deliveredVia).toBe('dev-console');
+  });
+});
+
+describe('stripe-license-bridge idempotency', () => {
+  test('duplicate eventId (Stripe retry) returns 200 without regenerating', async () => {
+    const event = buildSessionEvent({ productId: 'pro-30d' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+
+    const first = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(first.status).toBe(200);
+    expect(first.body.delivered).toBe(true);
+
+    const second = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(second.status).toBe(200);
+    expect(second.body.deduplicated).toBe(true);
+    // generateCodes called exactly once across both deliveries.
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(1);
+  });
+
+  test('two events for the same session reuse the same license (layer-2 idempotency)', async () => {
+    const sessionId = `cs_test_shared_${crypto.randomBytes(4).toString('hex')}`;
+    const eventA = buildSessionEvent({ productId: 'pro-30d', sessionId });
+    const eventB = buildSessionEvent({ productId: 'pro-30d', sessionId });
+
+    const payloadA = buildSignedPayload(eventA);
+    const payloadB = buildSignedPayload(eventB);
+
+    const rA = await bridge.handleWebhook({ rawBody: payloadA.rawBody, signatureHeader: payloadA.signatureHeader });
+    const rB = await bridge.handleWebhook({ rawBody: payloadB.rawBody, signatureHeader: payloadB.signatureHeader });
+
+    expect(rA.status).toBe(200);
+    expect(rA.body.delivered).toBe(true);
+    // Second event hits layer-1 idempotency by eventId — different eventId,
+    // so falls through to layer-2 by sessionId; sees existing delivered record.
+    expect(rB.status).toBe(200);
+    expect(rB.body.delivered).toBe(true);
+    expect(rB.body.codeId).toBe(rA.body.codeId); // SAME license code
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(1); // only one code generated
+  });
+});
+
+describe('stripe-license-bridge SMTP failure recovery (DC-057 acceptance)', () => {
+  beforeEach(() => {
+    // Inject SMTP BEFORE each test so SMTP_HOST is set when deliverCode runs.
+    injectSmtp(async () => { throw new Error('smtp-down'); });
+    process.env.SMTP_HOST = 'smtp.example.com';
+    process.env.SMTP_FROM = 'noreply@example.com';
+  });
+
+  test('SMTP failure persists license, returns 500, but customer can retrieve via lookup', async () => {
+    const event = buildSessionEvent({ productId: 'pro-180d' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+
+    const result = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(result.status).toBe(500);
+    expect(result.body.reason).toBe('email-failed');
+
+    // License IS persisted (the documented SMTP-failure recovery path).
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    const record = store.readBySession(event.data.object.id);
+    expect(record.code).toBeTruthy();
+    expect(record.status).toBe('pending_email');
+    expect(record.lastError).toMatch(/smtp-down/);
+
+    // The lookup endpoint serves the persisted code ANYWAY.
+    const lookup = bridge.lookupSession(event.data.object.id);
+    expect(lookup.status).toBe('pending_email');
+    expect(lookup.code).toBe(record.code);
+    expect(lookup.durationDays).toBe(180);
+    expect(lookup.productId).toBe('pro-180d');
+  });
+
+  test('Stripe retry after SMTP failure keeps retrying (customer recovers via lookup)', async () => {
+    const event = buildSessionEvent({ productId: 'pro-365d' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+
+    const first = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(first.status).toBe(500);
+
+    // Stripe retries with the SAME eventId. SMTP is still down → bridge
+    // keeps retrying (returns 500) until either SMTP recovers or Stripe
+    // gives up. The customer recovery path is via the lookup endpoint —
+    // the license IS persisted in the fulfillment store regardless.
+    const retry = await bridge.handleWebhook({ rawBody, signatureHeader });
+    expect(retry.status).toBe(500);
+
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    const record = store.readBySession(event.data.object.id);
+    expect(record.code).toBeTruthy();
+    expect(record.status).toBe('pending_email');
+
+    // Lookup serves the persisted code.
+    const lookup = bridge.lookupSession(event.data.object.id);
+    expect(lookup.code).toBe(record.code);
+
+    // Only one license generated across the retries (layer-2 idempotency).
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(1);
+  });
+
+  test('SMTP recovers on a subsequent attempt (different eventId, same session) — still reuses the persisted code', async () => {
+    let smtpCalls = 0;
+    injectSmtp(async () => {
+      smtpCalls++;
+      if (smtpCalls === 1) throw new Error('smtp-temp-down');
+      return { messageId: 'msg-ok' };
+    });
+
+    const sessionId = `cs_test_recover_${crypto.randomBytes(4).toString('hex')}`;
+    const eventA = buildSessionEvent({ productId: 'pro-30d', sessionId });
+    const eventB = buildSessionEvent({ productId: 'pro-30d', sessionId });
+
+    const payloadA = buildSignedPayload(eventA);
+    const payloadB = buildSignedPayload(eventB);
+
+    const rA = await bridge.handleWebhook({ rawBody: payloadA.rawBody, signatureHeader: payloadA.signatureHeader });
+    expect(rA.status).toBe(500); // first attempt: SMTP down
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(1);
+
+    // Read the persisted code from the store (rA.body doesn't include it on
+    // failure — by design, we don't leak license material in error responses).
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    const persistedCode = store.readBySession(sessionId).code;
+    expect(persistedCode).toBeTruthy();
+
+    const rB = await bridge.handleWebhook({ rawBody: payloadB.rawBody, signatureHeader: payloadB.signatureHeader });
+    expect(rB.status).toBe(200); // second event, same session: reuses persisted code, delivery succeeds
+    expect(rB.body.delivered).toBe(true);
+    // Same code reused, NOT a fresh generation.
+    expect(rB.body.codeId).toBeTruthy();
+
+    // The store's codeId matches rB.body.codeId (proves reuse, not regeneration).
+    expect(rB.body.codeId).toBe(store.readBySession(sessionId).codeId);
+
+    // No new license generated.
+    expect(licenseKeygenMock.__getGenerateCalls()).toBe(1);
+    expect(smtpCalls).toBe(2);
+  });
+});
+
+describe('stripe-license-bridge lookupSession', () => {
+  test('returns not_found for unknown sessionId', () => {
+    expect(bridge.lookupSession('cs_unknown')).toEqual({ status: 'not_found' });
+  });
+
+  test('returns expired for record past TTL', async () => {
+    const event = buildSessionEvent({ productId: 'pro-30d' });
+    const { rawBody, signatureHeader } = buildSignedPayload(event);
+    await bridge.handleWebhook({ rawBody, signatureHeader });
+
+    // Far-future "now" past the 24h TTL.
+    const future = Date.now() + 25 * 60 * 60 * 1000;
+    const lookup = bridge.lookupSession(event.data.object.id, { nowMs: future });
+    expect(lookup.status).toBe('expired');
+  });
+
+  test('returns processing state for fresh claim without code', async () => {
+    const store = createFulfillmentStore({ filePath: process.env.STRIPE_BRIDGE_FULFILLMENT_STORE_FILE });
+    const sessionId = `cs_test_processing_${crypto.randomBytes(4).toString('hex')}`;
+    await store.claim({ eventId: 'evt_pend', sessionId, productId: 'pro-30d', durationDays: 30, email: 'a@b.c' });
+    const lookup = bridge.lookupSession(sessionId);
+    expect(lookup.status).toBe('processing');
+    expect(lookup.durationDays).toBe(30);
+    expect(lookup.productId).toBe('pro-30d');
+  });
+});
+
+describe('stripe-license-bridge constants', () => {
+  test('LOOKUP_TTL_MS defaults to 24h', () => {
+    expect(bridge.LOOKUP_TTL_MS).toBe(24 * 60 * 60 * 1000);
+  });
+
+  test('DELIVERY_LEASE_MS is exported', () => {
+    expect(bridge.DELIVERY_LEASE_MS).toBeGreaterThan(0);
+  });
+});