All the documentation for that API refers to Messenger bots, not end users, and the quick start page discusses attaching your bot to a Facebook Page. Maybe I'm

All the documentation for that API refers to Messenger bots, not end users, and the quick start page discusses attaching your bot to a Facebook Page. Maybe I'm reading it wrong but this does not seem to be an API for creating alternative chat clients. A messages API definitely did exist years ago, but I'm pretty sure Facebook phased it out, along with many other APIs for user data. EDIT: here it is, deprecated: https://developers.facebook.com/docs/graph-api/reference/v2.10/user/inbox https://developers.facebook.com/docs/graph-api/reference/v2....