I want to give users the ability to get notifications via the facebook messenger. However, I don't really know how to get the fb_messenger_user_id
from a user.
I can get a personalized ID for the chat if a user starts chatting with my bot, but with this, I can't really verify which user that is. Is there something I've overseen? Something like a button similar to the "login with facebook" button?
Also, as far as I understand the docs, I am only allowed to send messages in a time frame of 24h after the last message from the user.
Can someone tell me how to use the facebook notifications properly?
As a side note: I am planning to implement botman into my existing app. I don't know how much this affects the notifications.