We have prepered a few samples:
Hybrid flow in ASP.NET core app
Hybrid flow in ASP.NET classic app
Hybrid flow in PHP app
Implicit flow in ASP.NET core app
To run these samples you will have to create an application in Xena and configure it.
In the samples you will need to change [Client ID] and secret if you chose Hybrid flow. On the Xena OAuth configuration page you will need to setup proper redirect uri.