How to use the uamqp.authentication.SASTokenAsync.from_shared_access_key function in uamqp

def _build_handler(self):
        auth = None if self.connection else authentication.SASTokenAsync.from_shared_access_key(**self.auth_config)
        self._handler = AMQPClientAsync(
            self.endpoint,
            loop=self.loop,
            auth=auth,
            debug=self.debug,
            properties=self.properties,
            error_policy=self.error_policy,
            encoding=self.encoding,
            **self.handler_kwargs)

def _build_handler(self):
        auth = None if self.connection else authentication.SASTokenAsync.from_shared_access_key(**self.auth_config)
        self._handler = ReceiveClientAsync(
            self.endpoint,
            auth=auth,
            debug=self.debug,
            properties=self.properties,
            error_policy=self.error_policy,
            client_name=self.name,
            auto_complete=False,
            encoding=self.encoding,
            loop=self.loop,
            **self.handler_kwargs)

try:
                expiry = int(parse_sas_token(token)['se'])
            except (KeyError, TypeError, IndexError):
                raise ValueError("Supplied SAS token has no valid expiry value.")
            return authentication.SASTokenAsync(
                self.auth_uri, self.auth_uri, token,
                expires_at=expiry,
                timeout=self.auth_timeout,
                http_proxy=self.http_proxy)

        username = username or self._auth_config['username']
        password = password or self._auth_config['password']
        if "@sas.root" in username:
            return authentication.SASLPlain(
                self.address.hostname, username, password, http_proxy=self.http_proxy)
        return authentication.SASTokenAsync.from_shared_access_key(
            self.auth_uri, username, password, timeout=self.auth_timeout, http_proxy=self.http_proxy)