Payment Setup Guide

• ✅ Zero integration cost
• ✅ No technical setup needed
• ❌ Manual verification required
• ❌ Delayed order confirmation
• ❌ Poor customer experience at scale

International Payment Processors

Best For: Global customers, card payments

• ✅ Credit/debit card support
• ✅ International reach
• ❌ Higher fees (2-4%)
• ❌ Currency conversion overhead
• ❌ Limited Vietnamese bank integration

Quick Setup Workflow

1. Account Registration → Create sandbox account for testing
2. API Credentials → Generate authentication tokens
3. Webhook Configuration → Set up payment notification endpoint
4. QR Code Integration → Add dynamic QR generation
5. Order Matching Logic → Parse transaction content
6. Testing → Verify sandbox transactions
7. Production Deployment → Switch to live environment

Key Capabilities

Implementation Checklist

Phase 1: Setup

• Register for sandbox account
• Generate API authentication token
• Configure webhook endpoint URL
• Test webhook with mock payload
• Verify 200 response handling

Phase 2: Integration

• Implement QR code generation
• Build checkout page UI
• Add order status polling
• Handle payment confirmation
• Test transaction matching logic

Phase 3: Security

• Implement timing-safe auth validation
• Add duplicate transaction prevention
• Enable HTTPS for webhooks
• Set up error logging
• Configure retry limits

Phase 4: Production

• Complete business verification
• Switch to production API endpoint
• Monitor webhook delivery rate
• Set up transaction reconciliation
• Configure customer support flows

Reference Files

Payment Gateway Integration Guide

Complete technical setup covering:

• Account creation and API configuration
• Webhook implementation with code examples
• Security best practices
• Testing and deployment procedures
• Troubleshooting common issues

Checkout Flow Design Patterns

UX optimization guide covering:

• High-conversion checkout page design
• QR code presentation strategies
• Mobile-responsive layouts
• Payment confirmation patterns
• Error handling workflows

Common Use Cases

E-commerce Store

• Customer selects products → Checkout → QR display → Bank scan → Auto-confirmation

Subscription Service

• Monthly billing → Generate unique QR → Track payment → Renew subscription

Event Ticketing

• Book tickets → Pay via QR → Instant confirmation → Send ticket

Digital Product Sales

• Purchase digital goods → QR payment → Auto-delivery after confirmation

Integration Effort Estimate

• Basic Setup: 2-4 hours (webhook + QR display)
• Full Checkout Flow: 1-2 days (UI + matching logic + testing)
• Production Hardening: 1-2 days (security + monitoring + edge cases)

Support Resources

• Sandbox environment for risk-free testing
• Webhook payload simulator
• Transaction history dashboard
• API documentation with examples
• Developer support channels

Next Steps

1. Read Payment Gateway Integration Guide for technical setup
2. Review Checkout Flow Design Patterns for UX best practices
3. Start with sandbox environment
4. Build webhook handler first
5. Add checkout UI incrementally
6. Test thoroughly before production launch