there is a FB login on my website, i can see Facebook app scoped user id which login to my website via fb login. I need to notify them with Fb messenger, is there need Webhook? can i send them message without waiting send message to my page. When i used them app scoped user id, graph api return an error and it says "No matching user found". What is the problem?
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you can only send messages to users after they sent your page a message or started using a bot. you can NOT send them a message just because they authorized your app on your website. – andyrandy Aug 27 '17 at 20:57
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thank you, can i send a message after 1 hour or 1 day if they sent a message to my page. Or should i send a message at the time when they sent? – Tony Stark Aug 27 '17 at 21:11
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yes, of course. why not just try? – andyrandy Aug 27 '17 at 21:41
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https://stackoverflow.com/questions/45910662/internal-server-error-while-setup-fb-webhook – Tony Stark Aug 28 '17 at 09:49