Values.UserDetailsSourceSpecifies the user name, server ID, and session ID for a workflow.
type nonrec t = {userName : UserName.t option;A unique string that identifies a Transfer Family user associated with a server.
*)serverId : ServerId.t option;The system-assigned unique identifier for a Transfer server instance.
*)sessionId : SessionId.t option;The system-assigned unique identifier for a session that corresponds to the workflow.
*)}