EC-CUBE3の決済連携はこんな感じがいいんじゃない？

gistfile1.diff

--- a/src/Eccube/Controller/ShoppingController.php
+++ b/src/Eccube/Controller/ShoppingController.php
@@ -134,6 +134,7 @@ class ShoppingController extends AbstractController
         $cartService = $app['eccube.service.cart'];
         $orderService = $app['eccube.service.order'];
         $orderRepository = $app['eccube.repository.order'];
+        $paymentService = $app['eccube.service.payment'];
 
         // カートチェック
         if (!$cartService->isLocked()) {
@@ -189,7 +190,15 @@ class ShoppingController extends AbstractController
                     $orderService->setOrderUpdate($em, $Order, $formData);
                     // 在庫情報を更新
                     $orderService->setStockUpdate($em, $Order);
-
+                    // 支払実行
+                    $paymentMethod = $app['payment.method'];
+                    $paymentMethod->setPayment($Order->getPayment());
+                    $orderResult = $paymentService->doCheckout($paymentMethod);
+                    if (!$orderResult->isSuccess()) {
+                        $em->getConnection()->rollback();
+                        $em->close();
+                        return $app->redirect($app->url('shopping_error'));
+                    }
                     if ($this->isGranted($app)) {
                         // 会員の場合、購入金額を更新
                         $orderService->setCustomerUpdate($em, $Order, $this->getUser($app));