To generate client code to access the API for your particular development language
You will now see the API definition in the left hand pane and a graphical version in the right hand pane. Now choose generate client, select your development language and a file will be generated for you containing complete source code to access the GeoAR.it endpoints. The GeoAR.it nuget library in this source code was generated using editor.swagger.io.
If you're a Visual Studio developer you can use the connected services option.