def get_access_token(self, flow):
        if not self._access_token:
            return self.create_access_token(flow)
        return self._access_token
Return Access Token. If not available, a new one will be created and saved.
dataset/ETHPy150Open django-dbbackup/django-dbbackup/dbbackup/storage/dropbox_storage.py/Storage.get_access_token