OAuth2 in IIS extension app

Hello,
in my IW application I am calling Microsoft Business Central API to inject orders.
Still now the Business Central tenant was hosted on-premise and I could call the API using basic authentication.
Cause the Business Central is moving to Cloud (SaaS) I need to authenticate with Microsoft OAuth2 to call the API.
Is it possible to use OAuth2 in a IW IIS extension?
Are there any sample to use OAuth2 with IW?
I downloaded the IW master samples from GIT where I found an OAuth2 sample but it asks for a user interaction to autheticate.
How should I implement it in a web server IIS IW application?

Thank you,
Davide