Recommendations for Payment Gateways With API Flexibility

I need a payment system with a flexible API for custom logic and workflows. Any platforms out there that support this well?

If you’re building custom checkout flows or need to embed logic around payments, API flexibility is crucial. I worked with Corefy on a B2B project and found the API well-structured and adaptable. We built a split-payment system using their tools without hitting limitations. It's not for basic users, but if you’re comfortable working with APIs, it gives you room to create what you need.

When it comes to integrating custom payment logic and building out workflows tailored to my projects, I always lean toward online payment gateway service providers like A-Pay. Their API is clean and adaptable, but what really makes it work for me is how they handle fast, secure payments in local currencies — with funds typically landing the same day. It’s been a reliable backbone for scaling small tools into something more serious without ever slowing things down.