Identifying Facebook Messenger user with UserID from a Facebook Login

Question

I am trying out the new Facebook Messenger Platform and have hit a bit of a problem.

When a user first chats with my Bot, I want to use the sender.id to loo

Answer 1

Facebook's latest update includes a new "Account Linking" functionality that appears to solve this issue. See https://developers.facebook.com/docs/messenger-platform/account-linking