如何使用Payum for Symfony为瑞士帐户启用Guest Checkout？

Question

如何为瑞士帐户启用Payum for Symfony的访客结帐？我使用Payum处理网站付款。问题在于快速结账功能，如图所示there：

<?php
//src/Acme/PaymentBundle/Controller
namespace AcmeDemoBundle\Controller;

use Symfony\Component\HttpFoundation\Request;

class PaymentController extends Controller
{
    public function preparePaypalExpressCheckoutPaymentAction()
    {
        $gatewayName = 'your_gateway_name';

        $storage = $this->get('payum')->getStorage('Acme\PaymentBundle\Entity\PaymentDetails');

        /** @var \Acme\PaymentBundle\Entity\PaymentDetails $details */
        $details = $storage->create();
        $details['PAYMENTREQUEST_0_CURRENCYCODE'] = 'USD';
        $details['PAYMENTREQUEST_0_AMT'] = 1.23;
        $storage->update($details);

        $captureToken = $this->get('payum')->getTokenFactory()->createCaptureToken(
            $gatewayName,
            $details,
            'acme_payment_done' // the route to redirect after capture;
        );

        return $this->redirect($captureToken->getTargetUrl());
    }
}

未启用访客结帐。