The complete reference (specification) of the REST API resources is found bundled with your software, or online:

About the REST specification structure

Resources are grouped by chapters: Content, Content Types and User. In each of those chapters, you will first get an overview, with a table crossing every resource with every applicable HTTP verb, and giving you a summary of the action.

Then throughout the chapter, grouped into sub-chapters, is the detailed documentation for every resource, with:

• The resource string
• The HTTP verb with override, if applicable
• A description of what this resource does
• Which headers are supported, and how to use them
• Which error codes can occur
• Most of the time, a request + response example