Generates a temporary profile link for the currently logged-in user.
exportedContactToken#41bf109b url:string expires:int = ExportedContactToken;
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contacts.exportContactToken#f8654027 = ExportedContactToken;
This constructor does not require any parameters.
Telegram clients must handle special tg:// and t.me deep links encountered in messages, link entities and in other apps by registering OS handlers.