The site is a lean, service-based web page built without any CMS—just HTML, CSS, a touch of JavaScript, and a lightweight PHP back end. Visitors already complete a “Register & Pay” form; the form is fully coded and functional, but payment currently stops at a placeholder. What I need now is for that final step to hand off to the Pixxels payment gateway and return a clear success or failure response. Here’s the flow I have in mind: 1. User submits the existing registration form. 2. Your script passes the reference, amount, and user email to the Pixxels API. 3. Pixxels processes the card, then calls my success, failure, or cancel URL. 4. On success, the site should store the transaction details in a small MySQL table (table already created) 5. On failure or cancel, display the proper message and log the outcome. Acceptance criteria • Smooth hand-off to Pixxels checkout from the existing form. • Callback handling that never exposes secret keys on the client side. • Clean, well-commented PHP or JavaScript (your choice) with no extra framework overhead. • A brief README that shows setup steps and which lines to edit for keys or environment paths. • Working demo on my staging server before final sign-off. Everything else—styles, layout, and registration validation—is already in place. Once your code is up and running, I can push straight to production.