code: def _retrieve_info(self, http):
          
          if self.invalid:
              info = _metadata.get_service_account_info(
                  http,
                  service_account=self.service_account_email or 'default')
              self.invalid = False
              self.service_account_email = info['email']
              self.scopes = info['scopes']
docs: Retrieves service account info for invalid credentials.
  
          Args:
              http: an object to be used to make HTTP requests.