docs: def validate(self):
          """
          Perform validation check on properties.
          """
          if not self.api_token or not self.api_token_secret:
              raise ImproperlyConfigured("'api_token' and 'api_token_secret' are required for authentication.")
  
          if self.response_type not in ["json", "pson", "xml", "debug", None]:
              raise ImproperlyConfigured("'%s' is an invalid response_type" % self.response_type)