redsys bundle configuration in sylius

config.yml

sylius_payment:
    gateways:
        redsys: Redsys

RedsysGatewayConfigurationType.php

<?php
namespace AppBundle\Form\Type\Payment;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Validator\Constraints\NotBlank;
class RedsysGatewayConfigurationType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('merchant_code', TextType::class, [
                'label' => 'Merchant Code',
                'constraints' => [
                    new NotBlank([
                        'message' => 'sylius.gateway_config.redsys.merchant_code.not_blank',
                        'groups' => 'sylius',
                    ])
                ],
            ])
            ->add('terminal', TextType::class, [
                'label' => 'Terminal',
                'constraints' => [
                    new NotBlank([
                        'message' => 'sylius.gateway_config.redsys.terminal.not_blank',
                        'groups' => 'sylius',
                    ])
                ],
            ])
            ->add('secret_key', TextType::class, [
                'label' => 'Secret Key',
                'constraints' => [
                    new NotBlank([
                        'message' => 'sylius.gateway_config.redsys.secret_key.not_blank',
                        'groups' => 'sylius',
                    ])
                ],
            ])
            ->add('sandbox', CheckboxType::class, [
                'label' => 'Sandbox'
            ])
        ;
    }
}

services.xml

 <service id="app.form_type_payment.redsys_gateway_configuration" class="AppBundle\Form\Type\Payment\RedsysGatewayConfigurationType">
       <tag name="sylius.gateway_configuration_type" type="redsys" label="app.payum_gateway_factory.redsys" />
       <tag name="form.type" />
 </service>

 <service id="payment.redsys.gateway_factory" class="Payum\Core\Bridge\Symfony\Builder\GatewayFactoryBuilder">
      <tag name="payum.gateway_factory_builder" factory="redsys"/>
      <argument>Crevillo\Payum\Redsys\RedsysGatewayFactory</argument>
 </service>