Hello, there is two main ways to add functionality to the login page, one is using a UUX payload, the other is significantly more challenging and that is entirely replacing the login screen. If it is just adding something to the flow, I recommend using the UUX Payload. If you would like to change the behavior of the authentication token you can also use the brand new adapter type extension to add backend functionality on authorization codes here: https://docs.q2developer.com/tutorials/adapter/index.html by choosing the Authentication token option.