Discussion API Documentation/Basic Getting Started Guide?

Hi, New to the game, and just read the release notes for 2.4 mention the "Companion API". I've done a quick search and can't see anything in the way of a tutorial or guide to getting started using this API. I assume is some kind of HTTP/json based thing, but where does it live? Is there a quick guide to the URI structure? Is it a local service that's only available while the client is running, or is it publicly hosted by Frontier? How do we authenticate with it?

Apologies if these are dumb questions and I've missed something that should have been obvious.
 
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