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=d47b90a5-4495-480a-a746-08485aeca693

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