I rewrote the section explaining what the
endpoint sends back to the server. This fixes
a few typos, emphasizes the normal case, and
starts to favor "content" as the key for
content.
This switches us to use the correct timestamp, service_id and token
formats. The 'service_id' should be the ID of the bot user. The token
should be a sample token generated from 'random_api_key()'.