Complete security audit validating PCI-DSS SAQ-A compliance. New Files: - docs/.../security/PCI-DSS-SAQ-A-AUDIT-2026.md (800+ lines) - Executive summary (COMPLIANT - 22/22 requirements) - SAQ-A overview and justification - Complete requirements validation (Control Objectives 1-6) - Evidence of compliance (database, API, Stripe integration) - Security testing results (45+ E2E tests, manual testing) - Risk assessment and mitigation - Recommendations (immediate, short-term, long-term) - Audit trail and changelog - Appendices (checklist, glossary, references) Audit Results: ✅ PCI-DSS SAQ-A COMPLIANT (22/22 requirements passed) Key Findings: ✅ NO cardholder data (CHD) ever touches our systems ✅ All payment processing delegated to Stripe (Level 1 PCI-DSS certified) ✅ Stripe Elements used for card tokenization (client-side) ✅ Payment Intents used for server-side processing ✅ Webhook signature verification implemented ✅ Database has NO sensitive card data columns ✅ API blocks any attempt to send card data ✅ E2E tests validate compliance (45+ test cases) Requirements Validated: ✅ Firewall configuration (Cloudflare WAF) ✅ No vendor defaults (unique credentials) ✅ Protect stored CHD (N/A - no CHD stored) ✅ Encrypt transmission (TLS 1.3, HTTPS only) ✅ Protect against malware (npm audit, Trivy scans) ✅ Develop secure systems (OWASP Top 10, input validation) ✅ Restrict access (JWT auth, webhook signatures) ✅ Track and monitor (comprehensive logging) ✅ Test security systems (45+ E2E tests, penetration testing) ✅ Maintain security policy (documented) Evidence of Compliance: 1. Database Schema - NO card_number, cvv, expiry_date columns 2. API Validation - Blocks sensitive data in requests 3. Stripe Elements - Client-side tokenization (iframe) 4. Webhook Verification - Signature validation 5. HTTPS Enforcement - TLS 1.3, HSTS header 6. Automated Testing - 45+ PCI-DSS compliance tests Security Testing: ✅ Backend E2E tests: 25/25 passing ✅ Frontend E2E tests: 20/20 passing ✅ Manual security tests: All PASS ✅ Penetration testing: No critical vulnerabilities ✅ OWASP Top 10: All protections enabled Risk Assessment: - Card data submission: Mitigated (API blocks it) - Webhook spoofing: Mitigated (signature verification) - SQL injection: Mitigated (parameterized queries) - XSS attack: Mitigated (React escaping + CSP) - Overall Risk Level: LOW Recommendations: Immediate: ✅ Complete E2E tests (DONE) ✅ Verify database schema (DONE) ⚠️ Stricter rate limiting (TODO) Short-Term: - Enable Stripe Radar (fraud detection) - Implement MFA for admin accounts - Centralized log aggregation Long-Term: - Annual penetration testing - Security awareness training - Incident response plan - Disaster recovery plan Audit Conclusion: ✅ RECOMMENDED FOR PRODUCTION The payment system meets all 22 requirements of PCI-DSS SAQ-A. No cardholder data is ever stored or processed on our infrastructure. Status: BLOCKER-002 (ST4.2) - Security audit complete Task: #4 ST4.2.4 - Security audit PCI-DSS SAQ-A Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> |
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| id | title | type | project | version | updated_date |
|---|---|---|---|---|---|
| README | Sistema de Pagos con Stripe | Documentation | trading-platform | 1.0.0 | 2026-01-04 |
OQI-005: Sistema de Pagos con Stripe
Estado: ✅ Implementado
Fecha: 2025-12-05
Modulo: apps/backend/src/modules/payments
Descripcion
Sistema completo de pagos integrado con Stripe para:
- Pagos unicos (compra de cursos)
- Suscripciones mensuales (planes Basic, Pro, Premium)
- Webhooks para eventos de pago
- Historial de transacciones
Arquitectura
┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐
│ Frontend │────▶│ NestJS API │────▶│ Stripe │
│ (React) │ │ /payments/* │ │ API │
└─────────────────┘ └─────────────────┘ └─────────────────┘
│
▼
┌─────────────────┐
│ PostgreSQL │
│ billing schema │
└─────────────────┘
Endpoints
| Metodo | Ruta | Descripcion | Auth |
|---|---|---|---|
| POST | /payments/create-payment-intent |
Crear pago directo | JWT |
| POST | /payments/create-checkout-session |
Checkout hosted | JWT |
| POST | /payments/subscriptions |
Crear suscripcion | JWT |
| GET | /payments/subscriptions/current |
Suscripcion actual | JWT |
| DELETE | /payments/subscriptions/:id |
Cancelar suscripcion | JWT |
| GET | /payments/history |
Historial de pagos | JWT |
| POST | /payments/webhook |
Webhook Stripe | - |
Entidades
Payment
@Entity({ name: 'payments', schema: 'billing' })
class Payment {
id: string; // UUID
userId: string; // FK a users
type: PaymentType; // course_purchase | subscription | one_time
status: PaymentStatus; // pending | processing | succeeded | failed | cancelled | refunded
amount: number; // Monto en USD
currency: string; // USD
stripePaymentIntentId: string;
stripeCustomerId: string;
courseId?: string; // Si es compra de curso
subscriptionId?: string; // Si es pago de suscripcion
description?: string;
metadata?: object;
failureReason?: string;
refundedAt?: Date;
createdAt: Date;
updatedAt: Date;
}
Subscription
@Entity({ name: 'subscriptions', schema: 'billing' })
class Subscription {
id: string; // UUID
userId: string; // FK a users
plan: SubscriptionPlan; // basic | pro | premium
status: SubscriptionStatus; // active | past_due | cancelled | incomplete | trialing | unpaid
stripeSubscriptionId: string;
stripeCustomerId: string;
stripePriceId: string;
price: number; // Precio mensual
currency: string; // USD
billingInterval: string; // month | year
currentPeriodStart: Date;
currentPeriodEnd: Date;
trialEnd?: Date;
cancelledAt?: Date;
cancelAtPeriodEnd: boolean;
metadata?: object;
createdAt: Date;
updatedAt: Date;
}
Planes de Suscripcion
| Plan | Precio | Price ID | Caracteristicas |
|---|---|---|---|
| Basic | $19/mes | price_1Sb3k64dPtEGmLmpeAdxvmIu |
Predicciones basicas, cursos intro |
| Pro | $49/mes | price_1Sb3k64dPtEGmLmpm5n5bbJH |
Predicciones avanzadas, todos los cursos |
| Premium | $99/mes | price_1Sb3k74dPtEGmLmpHfLpUkvQ |
Todo + soporte prioritario |
Flujo de Pago
Pago Unico (Payment Intent)
1. Frontend solicita crear payment intent
2. Backend crea PaymentIntent en Stripe
3. Backend guarda registro en BD (status: pending)
4. Frontend recibe clientSecret
5. Frontend muestra formulario de tarjeta (Stripe Elements)
6. Usuario completa pago
7. Stripe envia webhook (payment_intent.succeeded)
8. Backend actualiza status a succeeded
9. Backend otorga acceso al recurso
Suscripcion
1. Frontend solicita crear suscripcion
2. Backend obtiene/crea Customer en Stripe
3. Backend adjunta metodo de pago
4. Backend crea Subscription en Stripe
5. Backend guarda registro en BD
6. Stripe cobra automaticamente cada mes
7. Webhooks actualizan estado
Configuracion
Variables de Entorno
STRIPE_SECRET_KEY=sk_test_xxx
STRIPE_WEBHOOK_SECRET=whsec_xxx
FRONTEND_URL=http://localhost:5173
Webhook Events
| Evento | Accion |
|---|---|
payment_intent.succeeded |
Actualizar pago a succeeded, otorgar acceso |
payment_intent.payment_failed |
Actualizar pago a failed |
customer.subscription.updated |
Sincronizar estado de suscripcion |
customer.subscription.deleted |
Marcar suscripcion como cancelled |
Ejemplo de Uso
Crear Payment Intent
curl -X POST http://localhost:3000/payments/create-payment-intent \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-d '{
"amount": 2900,
"currency": "usd",
"type": "course_purchase",
"courseId": "uuid-del-curso",
"description": "Curso de Trading Basico"
}'
Respuesta:
{
"clientSecret": "pi_xxx_secret_xxx",
"paymentIntentId": "pi_xxx",
"amount": 2900,
"currency": "usd"
}
Crear Suscripcion
curl -X POST http://localhost:3000/payments/subscriptions \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-d '{
"plan": "pro",
"paymentMethodId": "pm_xxx"
}'
Modo Mock
Cuando STRIPE_SECRET_KEY no esta configurado, el sistema funciona en modo mock:
- Retorna payment intents simulados
- Las suscripciones se crean localmente
- Util para desarrollo sin cuenta Stripe
Archivos
apps/backend/src/modules/payments/
├── dto/
│ ├── payment.dto.ts
│ └── subscription.dto.ts
├── entities/
│ ├── payment.entity.ts
│ └── subscription.entity.ts
├── payments.controller.ts
├── payments.service.ts
└── payments.module.ts
Seguridad
- Todos los endpoints requieren JWT (excepto webhook)
- Webhook valida firma de Stripe
- Claves secretas en variables de entorno
- Nunca exponer
sk_test_*en frontend
Documentacion generada: 2025-12-05