$authCode = ask('Enter 2FA code: ');
            $steam->setTwoFactorCode($authCode);
        } else {
            $authCode = $steam->mobileAuth()->steamGuard()->generateSteamGuardCode();
            $steam->setTwoFactorCode($authCode);
            writeLine('Generated Steam Guard code: ' . $authCode);
        }
        $loginResult = $steam->doLogin();
    } else {
        if ($loginResult == LoginResult::NeedEmail) {
            $authCode = ask('Enter Steam Guard code from email: ');
            $steam->setEmailCode($authCode);
            $loginResult = $steam->doLogin();
        } else {
            if ($loginResult == LoginResult::NeedCaptcha) {
                $captchaCode = ask('Enter captcha (' . $steam->getCaptchaLink() . '): ');
                $steam->setCaptchaText($captchaCode);
                $loginResult = $steam->doLogin();
            } else {
                break;
            }
        }
    }
    writeLine("Login result: {$loginResult}.");
}
if ($loginResult == LoginResult::LoginOkay) {
    writeLine('Logged in successfully.');
    $tradeOffers = $steam->tradeOffers();
    var_dump($tradeOffers->getTradeOffersViaAPI(true));
    $trade = $tradeOffers->createTrade(12345);
    $trade->addOtherItem(730, 2, "12345678");