@property
    def access_token(self):
        return self.extra_data.get('access_token')
Given a mapping of 'scheme' to store_name, adds the mapping to the
dataset/ETHPy150Open omab/python-social-auth/social/storage/base.py/UserMixin.access_token--crossover with--dataset/ETHPy150Open openstack/glance_store/glance_store/location.py/register_scheme_map