The FetchApp API is implemented as RESTful (using all four verbs GET/POST/PUT/DELETE) over HTTP.  URIs are given with the RESTful option first, followed by alternative paths.

Every resource, like orders and products, has its own URL and is manipulated in isolation. The API is also usable by non-RESTful platforms as well using GET and POST only by adding on the appropriate command to the URI.

The following open-source libraries are available:

• Ruby
• PHP Library
• Java
• Simple PHP wrapper