Sonata\BasketBundle\Controller\BasketController::paymentStepAction PHP Method

    public function paymentStepAction()
    {
        $basket = $this->get('sonata.basket');
        if ($basket->countBasketElements() == 0) {
            return new RedirectResponse($this->generateUrl('sonata_basket_index'));
        }
        $customer = $basket->getCustomer();
        if (!$customer) {
            throw new HttpException('Invalid customer');
        }
        if (null === $basket->getBillingAddress()) {
            // If no payment address is specified, we assume it's the same as the delivery
            $billingAddress = clone $basket->getDeliveryAddress();
            $billingAddress->setType(AddressInterface::TYPE_BILLING);
            $basket->setBillingAddress($billingAddress);
        }
        $form = $this->createForm('sonata_basket_payment', $basket, array('validation_groups' => array('delivery')));
        if ($this->get('request')->getMethod() == 'POST') {
            $form->bind($this->get('request'));
            if ($form->isValid()) {
                // save the basket
                $this->get('sonata.basket.factory')->save($basket);
                return new RedirectResponse($this->generateUrl('sonata_basket_final'));
            }
        }
        $this->get('sonata.seo.page')->setTitle($this->get('translator')->trans('basket_payment_title', array(), 'SonataBasketBundle'));
        return $this->render('SonataBasketBundle:Basket:payment_step.html.twig', array('basket' => $basket, 'form' => $form->createView(), 'customer' => $customer));
    }