diff --git a/src/ApplePayPayment/Form/Type/GatewayConfigurationType.php b/src/ApplePayPayment/Form/Type/GatewayConfigurationType.php
index 6d760cbf..48077df1 100644
--- a/src/ApplePayPayment/Form/Type/GatewayConfigurationType.php
+++ b/src/ApplePayPayment/Form/Type/GatewayConfigurationType.php
@@ -7,6 +7,7 @@
 use CommerceWeavers\SyliusTpayPlugin\Form\Type\AbstractTpayGatewayConfigurationType;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Validator\Constraints\NotBlank;
 
 final class GatewayConfigurationType extends AbstractTpayGatewayConfigurationType
 {
@@ -23,6 +24,10 @@ public function buildForm(FormBuilderInterface $builder, array $options): void
                     'label' => 'commerce_weavers_sylius_tpay.admin.gateway_configuration.apple_pay_merchant_id',
                     'required' => true,
                     'priority' => -250,
+                    'constraints' => [
+                        new NotBlank(allowNull: false, groups: ['sylius']),
+                    ],
+                    'validation_groups' => ['sylius'],
                 ],
             )
         ;
diff --git a/src/GooglePayPayment/Form/Type/GatewayConfigurationType.php b/src/GooglePayPayment/Form/Type/GatewayConfigurationType.php
index 3bc9ae8c..d65a901d 100644
--- a/src/GooglePayPayment/Form/Type/GatewayConfigurationType.php
+++ b/src/GooglePayPayment/Form/Type/GatewayConfigurationType.php
@@ -7,6 +7,7 @@
 use CommerceWeavers\SyliusTpayPlugin\Form\Type\AbstractTpayGatewayConfigurationType;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Validator\Constraints\NotBlank;
 
 final class GatewayConfigurationType extends AbstractTpayGatewayConfigurationType
 {
@@ -23,6 +24,10 @@ public function buildForm(FormBuilderInterface $builder, array $options): void
                     'label' => 'commerce_weavers_sylius_tpay.admin.gateway_configuration.google_merchant_id',
                     'required' => true,
                     'priority' => -250,
+                    'constraints' => [
+                        new NotBlank(allowNull: false, groups: ['sylius']),
+                    ],
+                    'validation_groups' => ['sylius'],
                 ],
             )
         ;