code: def authorize(self, auth_session):
          
          # Ask access
          ask_access_response = auth_session.post(self.AUTHORIZE_URL, self.get_auth_params())
          url_queries = self.get_response_url_queries(ask_access_response)
  
          if 'access_token' not in url_queries:
              # Grant access
              grant_access_action = self.get_form_action(ask_access_response)
              grant_access_response = auth_session.post(grant_access_action)
              url_queries = self.get_response_url_queries(grant_access_response)
  
          return self.process_auth_url_queries(url_queries)
docs: OAuth2