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=28b388ae-a8ef-4118-a71b-e2839982d197

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