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