def METHOD_NAME(self):
    self.msg_auth = AuthorizeCoinJoin(
        coordinator="www.example.com",
        max_rounds=3,
        max_coordinator_fee_rate=int(0.3 * 10**8),
        max_fee_per_kvbyte=7000,
        address_n=[H_(84), H_(0), H_(0)],
        coin_name=self.coin.coin_name,
        script_type=InputScriptType.SPENDWITNESS,
    )
    self.authorization = CoinJoinAuthorization(self.msg_auth)
    storage.cache.start_session()