Fattmerchant Payments API

Build The Perfect Solution For Your Business

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Accept More Payments

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

Integrate Seamlessly

Create a customizable solution that works for your business with our RESTful API solutions.

Stay Secure

Our API is PCI-DSS compliant, so your payments are secure – no sensitive data ever hits your servers.

All The Benefits Of Fattmerchant, Customized For Your Business

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.



Reliable & Secure Payment Solution

Our software is fully PCI compliant, and card information is fully tokenized upon submission – ensuring the protection of both your organization and your clients’ sensitive information.

Extensive Documentation

Our solutions include integrating your existing CRM or shopping cart, incorporating invoicing and back office dashboard functionality, or adding a better functionality to your existing technical capabilities.

Simplify The Way You Do Business

Manage Payment Methods

Add or update payment methods for your customers – ensuring you always have the right information.

Leverage A Cloud-Based Catalog

Create and manage items, prices and discounts with our cloud based catalog.

Add An Optional Mobile Reader

Add our optional mobile reader to accept in-person payments with your smartphone.


Fattmerchant Payments Online

Additional Features

  • Accept partial payments and auto-update remaining balances.

  • Create and manage employee logins and assign admin roles.

  • Create, pause, and edit payment schedules.

  • Integrate with your favorite online solutions, like Quickbooks or Freshbooks.

  • Keep track of all types of payment transactions including cash payments.

  • See all transactions in one place, included drafts, unpaid, paid and deleted transactions.

  • View summary and sales dashboards

  • Get help completing your PCI compliance questionnaire

  • Enjoy a dedicated support team


The Fattmerchant Platform

Analytics, Reporting, Supplies & More!


View Robust Analytics

Make better, data-driven decisions with a comprehensive analytics dashboard.

Manage PCI Compliance

Keep your data secure and avoid penalties with PCI support.

Access Superior Support

Access our self-service portal, order supplies, or speak directly with a real human – never a robot!

See if Fattmerchant API is Right For You

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