Fattmerchant Payments API

Build The Perfect Solution For Your Business

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Support multiple ways to accept payments.

Integrate with the Fattmerchant Payments API to seamlessly accept all major credit cards, ACH payments and more in your app, website or software.

Customize your experience, your way.

Our RESTful HTTP API solution allows your developers to build an environment customized for your business – allowing you to easily send invoices and accept payments with all of the benefits of processing with Fattmerchant.

Rest Easy with Data Security.

Data security is always top of mind for us, and our API is PCI-DSS compliant, so your payment and customer information is secure – no sensitive data ever hits your servers.

Gain the knowledge to succeed.

Fattmerchant’s robust dashboard and reports give you insight into all areas of your business, allowing you to streamline your processes and align your staff and inventory with customer demand. With real-time information available to you on your mobile device from anywhere, your information is always at your fingertips.

Payment Processing, Your Way

Fattmerchant Payments API allows your developers to build an environment customized for your business – allowing you to seamlessly accept payments with all of the benefits of processing with Fattmerchant.



Simple Set Up

The Fattmerchant API is simple to set up, and we can help get you started with tutorials, videos and a wide range of support options.

Amplify Your Sales

Combining a robust invoicing solution with enhanced reporting means even deeper insights into your business than ever before. Learn what products are driving your sales, and how you can maximize your profits.

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What Our Members Are Saying

“We use the API to save cards on file when a patient calls to book an appointment with us. I love that Fattmerchant saves cards on file, which is really important to us.

In our industry, our patients often have balances left to be paid, so it’s a very simple process for us to have them sign an agreement to be charged after their appointment, so we don’t have to send paper statements to be paid at a later date.”

Why thousands of businesses love Fattmerchant

Cloud-Based
Log in and work from wherever you are. Your sales, products, and reporting all sync seamlessly across your devices.
Accept Any Payments
Key in payment methods, access securely stored banking or card information, and even keep track of cash, check or gift cards – all from one log in.
Connect Add-Ons
Connect with dozens of applications you already use to run your business, from accounting to ordering supplies, we’ve got you covered.
Awesome Customer Support
With access to 24/7 customer support and a voice-to-the-phone every time you call in, we’re here to help you when you need it!

See if Fattmerchant API is Right For You

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