A sophisticated, production-ready cross-border payment gateway that enables users to send and receive payments globally through multiple payment providers with AI-powered routing optimization.

• Multi-Platform Payment Integration: PayPal, Wise, Stripe, M-Pesa, and Payoneer support
• AI-Powered Payment Routing: Automatically selects optimal payment routes based on cost, speed, and reliability
• Real-Time Currency Conversion: Live exchange rates with transparent fee breakdown
• Smart Fallback Logic: Automatic rerouting when primary payment methods fail
• Offline Payment Queuing: Queue payments during network outages with automatic retry
• Real-Time Notifications: SMS and email updates via Twilio integration

• Responsive Design: Optimized for mobile, tablet, and desktop
• Interactive Dashboard: Transaction analytics with visual charts
• Payment Tracking: Real-time status updates and delivery confirmations
• Multi-Currency Support: 10+ major currencies with live conversion rates
• Secure Authentication: JWT-based authentication with bcrypt password hashing

• PostgreSQL Database: Robust data persistence with proper indexing
• RESTful API: Well-structured endpoints with validation and error handling
• Background Processing: Automated payment processing with cron jobs
• Rate Limiting: API protection against abuse
• Security Headers: Helmet.js for enhanced security
• Input Validation: Comprehensive validation using express-validator

• React 18 with TypeScript
• Tailwind CSS for styling
• Framer Motion for animations
• React Router for navigation
• Axios for API communication
• Recharts for data visualization
• React Hook Form for form management
• React Hot Toast for notifications

• Node.js with Express.js
• PostgreSQL database
• JWT for authentication
• bcryptjs for password hashing
• Helmet for security headers
• Express Rate Limit for API protection
• Node Cron for scheduled tasks
• Express Validator for input validation

• Stripe for card payments and bank transfers
• PayPal for digital wallet transactions
• Wise for international transfers
• Currency Layer for exchange rates
• Twilio for SMS notifications

• Node.js (v16 or higher)
• PostgreSQL (v12 or higher)
• npm or yarn package manager

git clone https://github.com/your-username/paybridge.git
cd paybridge

# Install frontend dependencies
npm install

# Install backend dependencies
npm run server:install

# Create PostgreSQL database
createdb paybridge

# The application will automatically create tables on first run

Create a .env file in the server directory:

# Database Configuration
DATABASE_URL=postgresql://username:password@localhost:5432/paybridge

# JWT Secret (generate a secure random string)
JWT_SECRET=your-super-secret-jwt-key-here

# Payment API Keys (use sandbox/test keys for development)
STRIPE_SECRET_KEY=sk_test_your_stripe_secret_key
STRIPE_PUBLISHABLE_KEY=pk_test_your_stripe_publishable_key

PAYPAL_CLIENT_ID=your_paypal_sandbox_client_id
PAYPAL_CLIENT_SECRET=your_paypal_sandbox_client_secret
PAYPAL_MODE=sandbox

# Currency Exchange API
CURRENCY_LAYER_API_KEY=your_currency_layer_api_key

# Twilio Configuration (for SMS notifications)
TWILIO_ACCOUNT_SID=your_twilio_account_sid
TWILIO_AUTH_TOKEN=your_twilio_auth_token
TWILIO_PHONE_NUMBER=your_twilio_phone_number

# Wise API (sandbox)
WISE_API_TOKEN=your_wise_sandbox_api_token
WISE_PROFILE_ID=your_wise_profile_id

# Server Configuration
PORT=5000
NODE_ENV=development

# Start both frontend and backend concurrently
npm run dev

# Or start them separately:
# Frontend (port 5173)
npm run dev:client

# Backend (port 5000)
npm run dev:server

paybridge/
├── src/                          # Frontend React application
│   ├── components/               # Reusable UI components
│   │   ├── Layout.tsx           # Main layout wrapper
│   │   └── LoadingSpinner.tsx   # Loading indicator
│   ├── contexts/                # React contexts
│   │   └── AuthContext.tsx     # Authentication context
│   ├── pages/                   # Page components
│   │   ├── LandingPage.tsx     # Marketing landing page
│   │   ├── LoginPage.tsx       # User authentication
│   │   ├── RegisterPage.tsx    # User registration
│   │   ├── Dashboard.tsx       # Main user dashboard
│   │   ├── SendMoney.tsx       # Payment sending flow
│   │   ├── ReceiveMoney.tsx    # Payment receiving setup
│   │   ├── TransactionHistory.tsx # Transaction management
│   │   └── PaymentMethods.tsx  # Payment method management
│   └── App.tsx                 # Main application component
├── server/                      # Backend Node.js application
│   ├── database/               # Database configuration
│   │   └── init.js            # Database initialization
│   ├── middleware/             # Express middleware
│   │   └── auth.js            # Authentication middleware
│   ├── routes/                 # API route handlers
│   │   ├── auth.js            # Authentication routes
│   │   ├── payments.js        # Payment processing routes
│   │   ├── users.js           # User management routes
│   │   └── exchange.js        # Currency exchange routes
│   ├── services/               # Business logic services
│   │   ├── paymentRouter.js   # AI-powered routing engine
│   │   ├── paymentProcessor.js # Payment processing logic
│   │   ├── paymentProviders.js # Payment provider integrations
│   │   └── notificationService.js # SMS/Email notifications
│   └── server.js              # Express server entry point
└── README.md                   # This file

• POST /api/auth/register - User registration
• POST /api/auth/login - User login

• GET /api/payments/methods - Get user payment methods
• POST /api/payments/methods - Add payment method
• POST /api/payments/send - Send money
• GET /api/payments/transactions - Get transaction history

• GET /api/users/profile - Get user profile
• GET /api/users/analytics - Get user analytics

• GET /api/exchange/rates - Get exchange rates
• GET /api/exchange/currencies - Get supported currencies

• JWT Authentication: Secure token-based authentication
• Password Hashing: bcrypt with salt rounds for password security
• Rate Limiting: Protection against brute force attacks
• Input Validation: Comprehensive validation on all endpoints
• CORS Configuration: Proper cross-origin resource sharing setup
• Security Headers: Helmet.js for additional security headers
• SQL Injection Protection: Parameterized queries with pg library

• Primary: Blue (#3B82F6) - Trust and reliability
• Secondary: Purple (#8B5CF6) - Innovation and technology
• Success: Green (#10B981) - Successful transactions
• Warning: Yellow (#F59E0B) - Pending states
• Error: Red (#EF4444) - Failed transactions

• Headings: Inter font family, bold weights
• Body: Inter font family, regular weight
• Code: Monospace for transaction IDs and technical data

• Base Unit: 8px grid system
• Component Padding: 16px, 24px, 32px
• Section Margins: 32px, 48px, 64px

• User registration and login
• Payment method addition
• Money sending flow (all steps)
• Transaction history viewing
• Dashboard analytics
• Responsive design on mobile/tablet
• Error handling and validation

Use tools like Postman or curl to test API endpoints:

# Register a new user
curl -X POST http://localhost:5000/api/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","password":"password123","firstName":"John","lastName":"Doe","country":"US","currency":"USD"}'

# Login
curl -X POST http://localhost:5000/api/auth/login \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","password":"password123"}'

# Build the frontend
npm run build

# Deploy the dist/ folder to your hosting provider

# Set environment variables on your hosting platform
# Deploy the server/ directory

• Use managed PostgreSQL services like:
  • Heroku Postgres
  • Railway PostgreSQL
  • DigitalOcean Managed Databases
  • AWS RDS

1. Create account at https://stripe.com
2. Get API keys from Dashboard > Developers > API keys
3. Add keys to .env file

1. Create developer account at https://developer.paypal.com
2. Create sandbox application
3. Get Client ID and Secret from app settings

1. Create business account at https://wise.com
2. Apply for API access
3. Get API token and profile ID

1. Create account at https://twilio.com
2. Get Account SID and Auth Token
3. Purchase phone number for SMS

• Transaction success rates
• Payment processing times
• User engagement metrics
• Error rates and types

• Query performance
• Connection pool usage
• Storage utilization

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

• Use TypeScript for type safety
• Follow ESLint configuration
• Use Prettier for code formatting
• Write descriptive commit messages

This project is licensed under the MIT License - see the LICENSE file for details.

For support and questions:

• Create an issue on GitHub
• Email: support@paybridge.com
• Documentation: https://docs.paybridge.com

• Core payment functionality
• Multi-provider integration
• User dashboard
• Transaction management

• Mobile app (React Native)
• Advanced analytics
• Multi-language support
• Cryptocurrency support

• Business accounts
• API for third-party integration
• Advanced fraud detection
• White-label solutions

Built with ❤️ by the PayBridge Team