def request_params(self, **kwargs) -> MutableMapping[(str, Any)]:
    params = super().request_params(**kwargs)
    params['types'] = 'public_channel'
    return params
def request_params(self, **kwargs) -> MutableMapping[(str, Any)]:
    params = super().request_params(**kwargs)
    params['types'] = 'public_channel'
    return params