The upvote endpoint records the content upvote. It is called with the type and post_id of the upvoted content in the URI:
https://content.sorce.io/wp-json/api/v1/audio/upvote/129
Returns
If the post ID exists and can be read it returns “upvote recorded” on success and “could not record upvote” on failure.
Example return
{ “message”: “upvote recorded”}