View Source ExTDLib.Object.UpdateServiceNotification (ExTDLib v0.0.4)

A service notification from the server was received. Upon receiving this the application must show a popup with the content of the notification.

NameTypeDescription
typestringNotification type. If type begins with "AUTHKEY_DROP", then two buttons "Cancel" and "Log out" must be shown under notification; if user presses the second, all local data must be destroyed using Destroy method.
contentMessageContentNotification content.

More details on telegram's documentation.