code: def register_auth_method(self, auth_method):
          
          if not self._loaded:
              raise PluginManagerNotLoadedException()
          self._user_manager.register_auth_method(auth_method)
docs: Register a new authentication method
  
              name
                  the name of the authentication method, typically displayed by the webapp
  
              input_to_display
  
              Only available after that the Plugin Manager is loaded