A pac4j implementation must implement the necessary web components based on the pac4j logics:

• the security filer to secure an URL, based on the SecurityLogic
• the callback endpoint to finish the login process for IndirectClient in web applications. Based on the CallbackLogic
• the logout endpoint to handle the local and central logouts, based on the LogoutLogic.

See How to implement pac4j for a new framework/tool to get more technical details.