def parse_response(self, response: requests.Response, stream_slice: Mapping[(str, Any)]=None, **kwargs) -> Iterable[Mapping]:
    return [{'message': f"Successfully joined channel: {stream_slice['channel_name']}"}]
def parse_response(self, response: requests.Response, stream_slice: Mapping[(str, Any)]=None, **kwargs) -> Iterable[Mapping]:
    return [{'message': f"Successfully joined channel: {stream_slice['channel_name']}"}]