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💳 Payment System

Overview​

Comprehensive payment processing system with Stripe integration, secure validation, and multi-channel support.

Features​

✅ Completed Features​

  • Secure Payment Processing: Stripe integration with server-side validation
  • Invoice Generation: Automated invoice creation with secure numbering
  • Tip Management: Built-in tip collection and distribution
  • Payment Status Tracking: Real-time payment status updates
  • Public Payment Support: Ticket-based payments without authentication
  • Refund Processing: Automated refund handling
  • Payment Analytics: Revenue tracking and reporting

🔄 In Progress​

  • Multiple Payment Methods: Credit cards, mobile payments, digital wallets
  • Recurring Payments: Subscription and membership payments
  • Payment Splitting: Multi-party payment distribution

📋 Planned​

  • Cryptocurrency Support: Bitcoin and other crypto payments
  • International Payments: Multi-currency support
  • Payment Plans: Installment and financing options

Architecture​

Components​

Payment System
├── Frontend Components
│   ├── PaymentPage.tsx
│   ├── PaymentForm.tsx
│   └── PaymentStatus.tsx
├── Backend Functions
│   ├── createSecurePaymentIntent
│   ├── finalizeSecurePayment
│   ├── getPaymentStatus
│   └── cancelPaymentIntent
└── External Services
    ├── Stripe API
    ├── Webhook Handlers
    └── Analytics Tracking

Data Flow​

  1. Payment Intent Creation: Client requests payment intent
  2. Server Validation: Validate visit, amount, and permissions
  3. Stripe Integration: Create payment intent with Stripe
  4. Client Processing: Handle payment with Stripe Elements
  5. Webhook Processing: Receive payment status updates
  6. Status Updates: Update visit and payment records

Security Features​

Server-Side Validation​

  • Amount validation ($0.50 - $1000.00)
  • Visit ownership verification
  • Payment status validation
  • Cryptographically secure invoice numbers

PCI Compliance​

  • Stripe handles sensitive card data
  • No card data stored locally
  • Secure token-based processing
  • Encrypted data transmission

Fraud Prevention​

  • 3D Secure authentication
  • Risk assessment scoring
  • Velocity checks
  • Geographic validation

API Endpoints​

Create Payment Intent​

POST /createSecurePaymentIntent
{
  "visitId": "string",
  "amount": "number",
  "tip": "number"
}

Finalize Payment​

finalizeSecurePayment({
  paymentIntentId: "string",
  visitId: "string"
})

Get Payment Status​

getPaymentStatus({
  visitId: "string"
})

Testing​

Unit Tests​

  • Payment intent creation
  • Amount validation
  • Error handling
  • Invoice generation

Integration Tests​

  • Stripe API integration
  • Webhook processing
  • Database updates
  • Status synchronization

Manual Testing​

  • Payment flow end-to-end
  • Error scenarios
  • Edge cases
  • Performance testing

Configuration​

Environment Variables​

STRIPE_SECRET_KEY=sk_live_...
STRIPE_PUBLISHABLE_KEY=pk_live_...
STRIPE_WEBHOOK_SECRET=whsec_...

Firebase Configuration​

// Firebase Functions secrets
STRIPE_SECRET_KEY
STRIPE_WEBHOOK_SECRET

Monitoring​

Key Metrics​

  • Payment success rate
  • Average payment time
  • Error rates by type
  • Revenue per transaction

Alerts​

  • Payment failures > 5%
  • High error rates
  • Webhook failures
  • Security incidents

Troubleshooting​

Common Issues​

Payment Intent Creation Fails​

  • Check visit ownership
  • Validate amount range
  • Verify user permissions
  • Check Stripe API status

Payment Processing Fails​

  • Verify card details
  • Check 3D Secure authentication
  • Validate billing address
  • Check fraud prevention rules

Webhook Processing Issues​

  • Verify webhook signature
  • Check endpoint availability
  • Validate payload format
  • Monitor error logs

Debug Commands​

# Check Stripe logs
stripe logs tail

# Test webhook locally
stripe listen --forward-to localhost:5001/webhook

# View payment details
stripe payments retrieve pi_xxx

Future Enhancements​

Short Term​

  • Mobile payment optimization
  • Payment method preferences
  • Automated refund processing
  • Enhanced analytics dashboard

Long Term​

  • Cryptocurrency integration
  • International payment support
  • AI-powered fraud detection
  • Blockchain-based receipts

Payment system ready for production! 💳