Facebook Messenger Platform: how to get user specific information? -

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i'm trying recent released facebook messenger platform , far good. worked , able create echo bot.

but i'm wondering how identify user started chatting in page. example, when user started chatting pid user (page specific user id).

making follow request facebook graph api:

get https://graph.facebook.com/v2.6/{page_specific_user_id}

i discovered can ask following fields: first_name,last_name , profile_pic.

so question is, how discover if user current customer of business page? there way of querying more information (like e-mail , real facebook user id)?

currently, there's no way this. best way prompt user enter information in chat or give them link mobile login page or other way of linking account chat.


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