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=41fa0fca-f44b-474c-b1d2-b05a14711e80

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