Visa Payment Gateway API Integration

The online-casino platform is already live; what it still lacks is a rock-solid Visa payment gateway connected through the provider’s REST API. The task is to wire up that Visa flow end-to-end—tokenisation, 3-D Secure, authorisation, capture, refunds, and the webhook callbacks—so every deposit and withdrawal is tracked in real time inside our existing back-office panel.

At this stage I only need Visa, yet the code has to stay modular so PayPal, Stripe, or even crypto can be slotted in later without a full rewrite. Clean, well-documented PHP or Node.js is preferred, but I’m open as long as the final module plugs straight into our current stack (MySQL + Redis) and passes the provider’s sandbox certification.

Deliverables
• Source code for the Visa API integration module
• SQL or migration scripts for any new tables
• Postman collection (or similar) showing successful sandbox transactions
• Brief setup guide so my in-house devs can deploy to staging in one go

Acceptance will be based on a test deposit and refund processed through the provider’s sandbox, with all callbacks correctly logged and wallet balances updated.