def METHOD_NAME(self, scope):
    """A method to return a list of requested scopes which are supported by
    this client. For instance, there is a ``scope`` column::
        def get_allowed_scope(self, scope):
            if not scope:
                return ''
            allowed = set(scope_to_list(self.scope))
            return list_to_scope([s for s in scope.split() if s in allowed])
    :param scope: the requested scope.
    :return: string of scope
    """
    raise NotImplementedError()