Custom Integration Install Overview

Heads up

This product is in Early Access. Custom Integrations with Fast require some development work in order to properly ingest calls from Fast to your system for new orders or updates, as well as occasional calls to Fast for things like refunds.

Welcome! You will find useful information regarding the design and specifications of the Fast API.

Fast's Custom Integration is intended for merchants who have custom built their own eCommerce site and want to use Fast checkout to eliminate the friction around checkout for their users and reduce cart abandonment!

Use of the Fast Developer Platform is subject to our Developer Terms of Use.