Liechtenstein is part of the Schengen area and is visited on a type C Schengen visa. The country has no mission of its own in Azerbaijan; Switzerland represents it on visa matters.
The consular fee is 35 euros, with no separate visa centre cost. Because the application is processed through the Swiss embassy, the route must make clear which country is your main destination.
Vaduz and the Alpine routes are the main destinations; as the country is small, the trip is usually combined with Switzerland or Austria. Viza.az helps work out the application route and prepare the documents.