The data-ref attribute that was defined with the entry point.
Indicate whether the event is an echo.
Indicate whether the event is sent to a standby channel.
The user that triggered the webhook event.
Checkbox plugin only. user_ref attribute that was defined in the checkbox plugin include.
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OptinEvent occurs when the send to Messenger plugin has been tapped, a user has accepted a message request using customer matching, or a user has opted in to receive messages via the checkbox plugin.
messaging_optinsCheck official reference.