The Facebook Messenger Platform Webhook API allows developers to programmatically receive messages and events from the Facebook Messenger Platform. Available callbacks include Message, Message Delivered, Message Read, Message Echo, Postback, Plugin Opt-in, Referral, Payment, Checkout Update, Pre-Checkout, Account Linking Event, Policy Enforcement Event, App Roles, Standby, Pass Thread Control, and Take Thread Control. Some of these are still in beta.
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