Interface ImageEchoEvent

ID of the app from which the message was sent.

Indicate whether the event is an echo.

Indicate whether the event is sent to a standby channel.

Message ID.

Custom string passed to the Send API as the metadata field. Only present if the metadata property was set in the original message.

Reference to the product id when the user sends a message from Facebook Shops product detail page.

Reference to the message id (mid) that this message is replying to.

The user that triggered the webhook event.

URL of the attachment type.