[ Version ( since = "0.13.8" ) ]
public string normalized_name { get; }
The normalized form of the user's own unique identifier on this protocol.
For example, on XMPP accounts this is the user's JID; on ICQ this is the user's UIN; and so on.
One can receive change notifications on this property by connecting to the notify signal and using this property as the signal detail.
This is not guaranteed to have been retrieved until prepare_async has
finished; until then, the value is null.