Payment API Integration Guide
Payment API integration should focus on reliability, security, and predictable transaction state handling from checkout initiation to final verification.
Core Technical Principles
- Use server-side API calls for sensitive operations.
- Implement idempotency for write requests.
- Verify webhook signatures before processing.
- Always confirm final status via API.
Go-Live Readiness
- Log request IDs and payment IDs.
- Test success, failure, expiry, and refund scenarios.
- Set alerts for webhook and API errors.
- Maintain rollback-ready deployment flow.
Slex Pay Developer Support
Slex Pay offers integration guidance and developer-focused implementation support so merchants can launch stable payment systems faster.