Rexpay III Service Optimization

This is an improved version of the Rexpay payment service with optimizations for higher authorization rates.

Key Improvements

1. Enhanced 3DS Handling

   • Smart 3DS version detection
   • Fallback from 3DS2 to 3DS1 when needed
   • Enriched device information for better authentication

2. Robust Error Handling

   • Exponential backoff retry mechanism
   • Smart retry strategies based on error types
   • Detailed error logging and monitoring

3. Data Validation

   • Card data validation with Luhn algorithm
   • Address validation
   • Currency validation and fallback options

4. Intelligent Routing

   • Smart subaccount selection based on success rates
   • Load balancing with success rate weighting
   • Currency and amount-based routing

5. Monitoring and Metrics

   • Detailed transaction logging
   • Performance metrics tracking
   • Success rate monitoring
   • Response time tracking

6. Security Enhancements

   • Improved card data encryption
   • Secure error handling
   • PCI-compliant data handling

Authorization Rate Optimization Features

1. Smart Retry Logic

   • Automatically retries failed transactions with different strategies
   • Falls back to 3DS1 if 3DS2 fails
   • Attempts currency conversion for unsupported currencies

2. Transaction Routing

   • Routes transactions to subaccounts with highest success rates
   • Considers transaction amount and currency
   • Implements load balancing to prevent overloading

3. Data Enrichment

   • Provides rich device information
   • Includes detailed billing information
   • Supports multiple 3DS UI types

4. Error Recovery

   • Implements exponential backoff for retries
   • Handles network errors gracefully
   • Provides detailed error information for debugging

Usage

const rexpayService = new RexpayV3Service();
rexpayService.MID = 'your-merchant-id';
rexpayService.APIKEY = 'your-api-key';

// Initialize payment
const result = await rexpayService.initializePayment(payment, AUTHTYPE.THREE);

Monitoring

The service includes comprehensive monitoring through the MetricsService:

• Transaction success rates
• Response times
• Error rates
• Authorization rates
• Processing times

Error Handling

The service implements sophisticated error handling:

• Retries for transient errors
• Fallback strategies for permanent errors
• Detailed error logging
• Metric tracking for errors

Configuration

Configure the service through environment variables:

REXPAY_SECRET_KEY=your-secret-key
REXPAY_ENCRYPTION_KEY=your-encryption-key
REXPAY_ENCRYPTION_IV=your-encryption-iv

Best Practices

1. Keep retry attempts reasonable (default: 3)
2. Monitor metrics for optimization opportunities
3. Regularly review and update routing strategies
4. Keep device information up to date
5. Implement proper error handling in consuming code