Optionalaccepted_Id of the subscribed app.
Optionalcorrelation_The value provided in field correlation_id of a send message request.
Optionalevent_Optionalevent_Timestamp of the event as provided by the underlying channels.
Optionalmessage_Context-dependent metadata. Refer to specific callback's documentation for exact information provided.
The project ID of the app which has subscribed for the callback.
Name of the trigger responsible for this event.
Timestamp marking when the channel callback was accepted/received by the Conversation API.