Developer Tools

Fattmerchant’s robust set of tools for developers empowers businesses to build the perfect payment solution.


Add a robust payment processing solution to your app, website, software, or hardware complete with customer management, inventory tracking, invoicing, recurring billing, and more. Extending the capabilities of your solution has never been easier!

iOS and Android SDKs

Take payments on-the-go with our mobile app by leveraging our developer-friendly SDKs for iOS and Android.


Accept payments and protect your sensitive data with the easiest to use Javascript library for payments available.

mobile payment processing

Robust Documentation and Simple Set Up

Fattmerchant’s documentation provides simple setup, and our seasoned developers can help you get started. Plus, our tutorials, videos, and a wide range of support options are always available.

Card Present and Card Not Present Functionality

Our developer tools make it possible for your business to accept payments in person or remotely with our card present and card not present functionality available in a single API.

Payments Exactly How You Want Them

Build a payment experience unique to your business with our lineup of developer-friendly tools. All of the robust capabilities of Fattmerchant in your very own app mean better payment processing for you and your customers.

Take the Next Step with Fattmerchant

One API for Powerful Payment Processing

It’s easy to connect your app or product to accept credit card payments online. With our simple documentation and smart support, you’ll be up and running in no time. Just fill out the form to request a free analysis and find out how we can work with your business!