Deletes the token from the store
        :return bool: Success / Failure

def delete_token(self):
        """
        Deletes the token from the store
        :return bool: Success / Failure
        """
        try:
            self.doc_ref.delete()
        except Exception as e:
            log.error('Could not delete the token (key: {}): {}'.format(self.doc_id, str(e)))
            return False
        return True