OptionalaliasShort handle or alias for the actor, used as an alternate display identifier. null if not configured.
OptionalidComposite actor identifier. Format is "user-<usr_...>" for human users or "agent-<agi_...>" for agents.
OptionalnameDisplay name of the actor shown in the UI. null if no name is set.
Optionalprofile_Profile picture for the actor. null if the actor has no profile picture.
The entity that authored a message, either a human user or an agent.