This is a an app that shows how to integrate with Promise.

Promise uses a simplified version of the Implicit Flow in OpenID Connect.

The Authentication Request is issued by redirecting the user to

https://promiseauthentication.org/a/ruby.promiseauthentication.org?nonce=859b4364-6efb-4cfe-b516-ee3c8ff8ae80

That is what happens when you click the green button. Go ahead.