diff --git a/GraphQL/Mutation/AbstractMutation.php b/GraphQL/Mutation/AbstractMutation.php
index f321b63..64cb3cd 100644
--- a/GraphQL/Mutation/AbstractMutation.php
+++ b/GraphQL/Mutation/AbstractMutation.php
@@ -58,6 +58,7 @@ protected function getInputObject(FormInterface $form): InputObjectType
     {
         $fields = [];
         $this->convertArgs($form, $fields);
+
         return new InputObjectType([
             'name' => $form->getName().'Input',
             'fields' => $fields,
@@ -133,16 +134,18 @@ protected function convertArgs(FormInterface $form, array &$args = []): void
 
     public function getMutation(): array
     {
+        $args = [];
         $builder = $this->formFactory->createBuilder($this->getArgsType(), null, ['csrf_protection' => false]);
         $form = $builder->getForm();
+        if ($form->getName() !== 'form') {
+            $args['input'] = [
+                'type' => $this->getInputObject($form),
+            ];
+        }
 
         return [
             'type' => $this->types->get($this->getTypesClass()),
-            'args' => [
-                'input' => [
-                    'type' => $this->getInputObject($form),
-                ],
-            ],
+            'args' => $args,
             'resolve' => function ($value, array $args, $context, ResolveInfo $info) use ($form) {
                 return $this->resolver($value, $args, $context, $info, $form);
             }
@@ -198,7 +201,9 @@ protected  function convertFormValues(FormInterface $form, &$formValues = [], $i
     protected function resolver($value, array $args, $context, ResolveInfo $info, FormInterface $form): mixed
     {
         $formValues = [];
-        $this->convertFormValues($form, $formValues, $args['input']);
+        if (array_key_exists('input', $args)) {
+            $this->convertFormValues($form, $formValues, $args['input']);
+        }
 
         $form->submit($formValues);
         if (!$form->isValid()) {
diff --git a/GraphQL/Mutation/PurchaseMutation.php b/GraphQL/Mutation/PurchaseMutation.php
index d1ea77d..838b35a 100644
--- a/GraphQL/Mutation/PurchaseMutation.php
+++ b/GraphQL/Mutation/PurchaseMutation.php
@@ -31,13 +31,12 @@
 use Eccube\Service\PurchaseFlow\PurchaseFlow;
 use Eccube\Service\PurchaseFlow\PurchaseFlowResult;
 use Plugin\Api42\GraphQL\Error\InvalidArgumentException;
-use Plugin\Api42\GraphQL\Mutation;
 use Plugin\Api42\GraphQL\Types;
+use Symfony\Component\Form\Extension\Core\Type\FormType;
+use Symfony\Component\Form\FormFactoryInterface;
 
-class PurchaseMutation implements Mutation
+class PurchaseMutation extends AbstractMutation
 {
-    private Types $types;
-
     private EntityManager $entityManager;
     private CartService $cartService;
     private OrderHelper $orderHelper;
@@ -55,8 +54,8 @@ public function __construct(
         PurchaseFlow $cartPurchaseFlow,
         PaymentMethodLocator $locator,
         MailService $mailService,
+        FormFactoryInterface $formFactory,
     ) {
-        $this->types = $types;
         $this->entityManager = $entityManager;
         $this->cartService = $cartService;
         $this->orderHelper = $orderHelper;
@@ -64,6 +63,8 @@ public function __construct(
         $this->cartPurchaseFlow = $cartPurchaseFlow;
         $this->locator = $locator;
         $this->mailService = $mailService;
+        $this->setTypes($types);
+        $this->setFormFactory($formFactory);
     }
 
     public function getName(): string
@@ -71,16 +72,17 @@ public function getName(): string
         return 'purchaseMutation';
     }
 
-    public function getMutation(): array
+    public function getTypesClass(): string
+    {
+        return Order::class;
+    }
+
+    public function getArgsType(): string
     {
-        return [
-            'type' => $this->types->get(Order::class),
-            'args' => [],
-            'resolve' => [$this, 'purchaseMutation'],
-        ];
+        return FormType::class;
     }
 
-    public function purchaseMutation()
+    public function executeMutation($root, array $args): mixed
     {
         $Customer = $this->securityContext->getLoginUser();
         if (!$Customer instanceof Customer) {
diff --git a/GraphQL/Mutation/ShoppingMutation.php b/GraphQL/Mutation/ShoppingMutation.php
index cab04ca..3c5992b 100644
--- a/GraphQL/Mutation/ShoppingMutation.php
+++ b/GraphQL/Mutation/ShoppingMutation.php
@@ -27,10 +27,11 @@
 use Eccube\Service\PurchaseFlow\PurchaseFlowResult;
 use Plugin\Api42\GraphQL\Error\InvalidArgumentException;
 use Plugin\Api42\GraphQL\Error\ShoppingException;
-use Plugin\Api42\GraphQL\Mutation;
 use Plugin\Api42\GraphQL\Types;
+use Symfony\Component\Form\Extension\Core\Type\FormType;
+use Symfony\Component\Form\FormFactoryInterface;
 
-class ShoppingMutation implements Mutation
+class ShoppingMutation extends AbstractMutation
 {
     private Types $types;
 
@@ -47,13 +48,15 @@ public function __construct(
         OrderHelper $orderHelper,
         SecurityContext $securityContext,
         PurchaseFlow $cartPurchaseFlow,
+        FormFactoryInterface $formFactory,
     ) {
-        $this->types = $types;
         $this->entityManager = $entityManager;
         $this->cartService = $cartService;
         $this->orderHelper = $orderHelper;
         $this->securityContext = $securityContext;
         $this->cartPurchaseFlow = $cartPurchaseFlow;
+        $this->setTypes($types);
+        $this->setFormFactory($formFactory);
     }
 
     public function getName(): string
@@ -61,21 +64,23 @@ public function getName(): string
         return 'orderMutation';
     }
 
-    public function getMutation(): array
+    public function getTypesClass(): string
     {
-        return [
-            'type' => $this->types->get(Order::class),
-            'args' => [],
-            'resolve' => [$this, 'orderMutation'],
-        ];
+        return Order::class;
+    }
+
+    public function getArgsType(): string
+    {
+        return FormType::class;
     }
 
     /**
+     * @return Order|null
      * @throws InvalidArgumentException
      * @throws ORMException
      * @throws ForeignKeyConstraintViolationException
      */
-    public function orderMutation($root, $args): ?Order
+    public function executeMutation($root, $args): mixed
     {
         $user = $this->securityContext->getLoginUser();