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Stripe Payment Integration - Implementation Summary

✅ Completed Implementation

Backend (Ballerina)

  1. Added Stripe Dependency

    • Updated Ballerina.toml with ballerinax/stripe:3.0.0

  2. Created Payment Module (modules/payment/)

    • payment_service.bal - Core Stripe integration functions
    • payment_controller.bal - HTTP API endpoints
    • types.bal - Type definitions
    • Module.md - Documentation

  3. API Endpoints (Port 8098)

    • POST /api/payment/create-intent - Create payment intent
    • POST /api/payment/confirm-payment - Confirm payment
    • GET /api/payment/intent/{id} - Get payment status
    • POST /api/payment/customer - Create Stripe customer
    • POST /api/payment/webhook - Handle webhooks

  4. Database Schema

    • payment_intents table for tracking payments
    • payment_methods table for user payment methods
    • stripe_customers table for customer mapping
    • Enhanced wallet_transactions with payment references

  5. Configuration

    • Added Stripe keys to Config.toml.template
    • Integrated with existing auth middleware

Frontend (Next.js/React 19)

  1. Package Installation

    • @stripe/stripe-js and @stripe/react-stripe-js (with --legacy-peer-deps)

  2. Created Components

    • StripeDepositModal.tsx - Complete payment flow modal
    • Updated DepositModal.tsx - Added Stripe option
    • Removed incompatible React Stripe components

  3. Created Services

    • paymentService.ts - API communication service
    • Updated stripe.ts - Stripe utilities (React 19 compatible)

  4. API Routes (Frontend)

    • /api/payment/create-intent - Proxy to backend
    • /api/payment/confirm-payment - Proxy to backend
    • /api/payment/intent/[id] - Proxy to backend
    • /api/payment/customer - Proxy to backend

  5. Configuration

    • Added NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY to .env
    • Added NEXT_PUBLIC_PAYMENT_API_URL to .env

🎯 Key Features Implemented

Payment Flow

  1. User selects "Credit/Debit Card" in deposit modal
  2. Amount validation and payment intent creation
  3. Stripe.js loads dynamically (React 19 compatible)
  4. Secure card input with real-time validation
  5. Payment confirmation and wallet balance update
  6. Transaction logging and audit trail

Security Features

  • Server-side payment intent creation
  • Client-side card tokenization (never store card data)
  • Payment confirmation with backend verification
  • Webhook support for payment events
  • User authentication required for all operations

User Experience

  • Multi-step payment flow with clear progress
  • Real-time validation and error handling
  • Loading states and success feedback
  • Mobile-responsive design
  • Dark mode support

🔧 Setup Requirements

Backend Setup

  1. Get Stripe Keys from Stripe Dashboard
  2. Update Config.toml: 
    stripeSecretKey = "sk_test_your-secret-key"
stripeWebhookSecret = "whsec_your-webhook-secret"
  3. Run Database Migration: 
    psql -U username -d database -f backend/scripts/payment_schema.sql
  4. Start Backend: 
    cd backend && bal run

Frontend Setup

  1. Install Dependencies (already done): 
    npm install @stripe/stripe-js @stripe/react-stripe-js --legacy-peer-deps
  2. Update .env: 
    NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=pk_test_your-publishable-key
NEXT_PUBLIC_PAYMENT_API_URL=http://localhost:8098
  3. Start Frontend: 
    npm run dev

🧪 Testing

Test Cards (Stripe Test Mode)

  • Successful Payment: 4242424242424242
  • Declined Payment: 4000000000000002
  • Authentication Required: 4000002500003155

Test Flow

  1. Navigate to wallet dashboard
  2. Click "Deposit Funds"
  3. Select "Credit/Debit Card" option
  4. Enter amount and continue
  5. Use test card details
  6. Complete payment and verify wallet update

🔐 Production Checklist

  • Replace test keys with live keys
  • Set up webhook endpoint with HTTPS
  • Configure proper error monitoring
  • Set up database backups
  • Implement rate limiting
  • Add compliance features (PCI DSS)

📚 Documentation

  • Complete setup guide: STRIPE_SETUP.md
  • Payment schema: backend/scripts/payment_schema.sql
  • API documentation: backend/modules/payment/Module.md

⚠️ React 19 Compatibility Notes

Due to React 19 compatibility issues with @stripe/react-stripe-js, we implemented:

  • Direct Stripe.js integration without React components
  • Dynamic script loading for Stripe.js
  • Custom card element integration
  • Manual payment flow handling

This approach is more reliable and gives us full control over the payment experience.