Event is triggered after the Messenger.retransmitEvents or Messenger.unsubscribe methods is called.
Get action that is the reason this event was triggered
Get messenger event type if this messenger event was retransmitted.
Get Voximplant user identifier, ex 'email@example.com', for the user that initiated the event.
List of full Voximplant user identifiers (ex 'firstname.lastname@example.org') for the subscription.