def user_data(self, access_token, *args, **kwargs):
        user_id_url = kwargs.get('response').get('id')
        url = user_id_url + '?' + urlencode({'access_token': access_token})
        try:
            return self.get_json(url)
        except ValueError:
            return None
Get the backend-specific identifier for this node.
dataset/ETHPy150Open omab/python-social-auth/social/backends/salesforce.py/SalesforceOAuth2.user_data--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/blockdevice.py/IBlockDeviceAPI.compute_instance_id