Is there a way to get user's email address from a messenger app on a facebook page? I realize facebook gives me page scoped IDs, but you can't get a User node based on that.
No, the information you get from Facebook Messenger Platform are:
- first_name - First name
- last_name - Last name
- profile_pic - Profile picture
- locale - Locale of the user on Facebook
- timezone - Timezone, number relative to GMT
- gender - Gender
- is_payment_enabled - Is the user eligible to receive messenger platform payment messages
The trouble is that FB IDs and Messenger IDs are different.
来源：https://stackoverflow.com/questions/41842905/is-there-a-way-to-get-users-email-address-from-a-messenger-app-on-a-facebook-pa