Visa/Mastercard Payment Integration

I’m ready to start accepting credit-card payments on my site and need an expert who can guide me from merchant-account setup right through to a live integration. The scope is straightforward: one-time charges only, limited to Visa and Mastercard.

Here’s what I’m looking for:
• Help selecting or activating a suitable merchant account and gateway that supports Visa/Mastercard.
• Secure API integration into my existing stack (REST/JSON preferred, but I’m open as long as PCI-DSS best practices are met).
• Front-end payment form or hosted checkout configured for a smooth customer experience.
• End-to-end testing with test cards and real $0.01 transactions before switching to live mode.
• Clear hand-over notes so I can manage refunds, captures, and reporting on my own.

If you’ve recently implemented similar single-payment flows and can deliver clean, documented code plus sandbox and live verification, let’s get started.