diff --git a/services/platform-service/src/modules/subscriptions/routes.test.ts b/services/platform-service/src/modules/subscriptions/routes.test.ts
new file mode 100644
index 00000000..8228f7eb
--- /dev/null
+++ b/services/platform-service/src/modules/subscriptions/routes.test.ts
@@ -0,0 +1,190 @@
+/**
+ * Route-level tests for subscriptions module — Fastify inject.
+ */
+
+import Fastify from 'fastify';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+const repoMock = {
+  getByUserId: vi.fn(),
+  getByStripeCustomerId: vi.fn(),
+  getByStripeCustomerIdAnyProduct: vi.fn(),
+  createSubscription: vi.fn(),
+  updateSubscription: vi.fn(),
+  getPaymentsByUser: vi.fn(),
+  createPayment: vi.fn(),
+};
+
+vi.mock('./repository.js', () => repoMock);
+
+vi.mock('../../lib/request-context.js', () => ({
+  getRequestProductId: () => 'lysnrai',
+}));
+
+const baseSub = {
+  id: 'sub_user_1_123',
+  productId: 'lysnrai',
+  userId: 'user_1',
+  plan: 'pro',
+  status: 'active',
+  currentPeriodStart: '2026-02-01T00:00:00Z',
+  currentPeriodEnd: '2026-03-01T00:00:00Z',
+  cancelAtPeriodEnd: false,
+  monthlyPrice: 9.99,
+  tokensIncluded: 100000,
+  tokensUsed: 5000,
+  createdAt: '2026-02-01T00:00:00Z',
+  updatedAt: '2026-02-01T00:00:00Z',
+};
+
+describe('subscriptionRoutes', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('GET /subscriptions/:userId returns subscription', async () => {
+    repoMock.getByUserId.mockResolvedValue(baseSub);
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({ method: 'GET', url: '/api/subscriptions/user_1' });
+    expect(res.statusCode).toBe(200);
+    const data = JSON.parse(res.body);
+    expect(data.plan).toBe('pro');
+  });
+
+  it('GET /subscriptions/:userId returns 404 when not found', async () => {
+    repoMock.getByUserId.mockResolvedValue(null);
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({ method: 'GET', url: '/api/subscriptions/user_1' });
+    expect(res.statusCode).toBe(404);
+  });
+
+  it('POST /subscriptions creates a subscription', async () => {
+    repoMock.createSubscription.mockResolvedValue(baseSub);
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({
+      method: 'POST',
+      url: '/api/subscriptions',
+      payload: {
+        userId: 'user_1',
+        plan: 'pro',
+        status: 'active',
+        monthlyPrice: 9.99,
+        tokensIncluded: 100000,
+      },
+    });
+    expect(res.statusCode).toBe(201);
+  });
+
+  it('POST /subscriptions with trial days', async () => {
+    repoMock.createSubscription.mockResolvedValue(baseSub);
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({
+      method: 'POST',
+      url: '/api/subscriptions',
+      payload: {
+        userId: 'user_1',
+        plan: 'pro',
+        status: 'trialing',
+        monthlyPrice: 9.99,
+        tokensIncluded: 100000,
+        trialDays: 14,
+      },
+    });
+    expect(res.statusCode).toBe(201);
+  });
+
+  it('POST /subscriptions rejects invalid input', async () => {
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({
+      method: 'POST',
+      url: '/api/subscriptions',
+      payload: { plan: 'invalid' },
+    });
+    expect(res.statusCode).toBe(400);
+  });
+
+  it('PUT /subscriptions/:userId updates subscription', async () => {
+    repoMock.getByUserId.mockResolvedValue(baseSub);
+    repoMock.updateSubscription.mockResolvedValue({ ...baseSub, plan: 'enterprise' });
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({
+      method: 'PUT',
+      url: '/api/subscriptions/user_1',
+      payload: { plan: 'enterprise' },
+    });
+    expect(res.statusCode).toBe(200);
+    const data = JSON.parse(res.body);
+    expect(data.plan).toBe('enterprise');
+  });
+
+  it('PUT /subscriptions/:userId returns 404 when not found', async () => {
+    repoMock.getByUserId.mockResolvedValue(null);
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({
+      method: 'PUT',
+      url: '/api/subscriptions/user_1',
+      payload: { plan: 'enterprise' },
+    });
+    expect(res.statusCode).toBe(404);
+  });
+
+  it('GET /payments/:userId lists payments', async () => {
+    const payment = { id: 'pay_1', amount: 999, currency: 'usd', status: 'succeeded' };
+    repoMock.getPaymentsByUser.mockResolvedValue([payment]);
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({ method: 'GET', url: '/api/payments/user_1' });
+    expect(res.statusCode).toBe(200);
+    const data = JSON.parse(res.body);
+    expect(data.payments).toHaveLength(1);
+  });
+
+  it('POST /payments records a payment', async () => {
+    const payment = { id: 'pay_1', amount: 999, currency: 'usd', status: 'succeeded' };
+    repoMock.createPayment.mockResolvedValue(payment);
+    const { subscriptionRoutes } = await import('./routes.js');
+    const app = Fastify({ logger: false });
+    await app.register(subscriptionRoutes, { prefix: '/api' });
+
+    const res = await app.inject({
+      method: 'POST',
+      url: '/api/payments',
+      payload: {
+        userId: 'user_1',
+        amount: 999,
+        currency: 'usd',
+        status: 'succeeded',
+        description: 'Pro plan',
+        method: 'card',
+      },
+    });
+    expect(res.statusCode).toBe(201);
+  });
+});