Install the Payments Glue API

<?php

namespace Pyz\Glue\PaymentsRestApi;

use Spryker\Glue\PaymentsRestApi\PaymentsRestApiConfig as SprykerPaymentsRestApiConfig;
use Spryker\Shared\DummyPayment\DummyPaymentConfig;

class PaymentsRestApiConfig extends SprykerPaymentsRestApiConfig
{
    protected const PAYMENT_METHOD_PRIORITY = [
        DummyPaymentConfig::PAYMENT_METHOD_INVOICE => 1,
        DummyPaymentConfig::PAYMENT_METHOD_CREDIT_CARD => 2,
    ];

    protected const PAYMENT_METHOD_REQUIRED_FIELDS = [
        DummyPaymentConfig::PROVIDER_NAME => [
            DummyPaymentConfig::PAYMENT_METHOD_INVOICE => [
                'dummyPaymentInvoice.dateOfBirth',
            ],
            DummyPaymentConfig::PAYMENT_METHOD_CREDIT_CARD => [
                'dummyPaymentCreditCard.cardType',
                'dummyPaymentCreditCard.cardNumber',
                'dummyPaymentCreditCard.nameOnCard',
                'dummyPaymentCreditCard.cardExpiresMonth',
                'dummyPaymentCreditCard.cardExpiresYear',
                'dummyPaymentCreditCard.cardSecurityCode',
            ],
        ],
    ];
}

<?php

namespace Pyz\Glue\GlueApplication;

use Spryker\Glue\CheckoutRestApi\CheckoutRestApiConfig;
use Spryker\Glue\GlueApplication\GlueApplicationDependencyProvider as SprykerGlueApplicationDependencyProvider;
use Spryker\Glue\GlueApplicationExtension\Dependency\Plugin\ResourceRelationshipCollectionInterface;
use Spryker\Glue\PaymentsRestApi\Plugin\GlueApplication\PaymentMethodsByCheckoutDataResourceRelationshipPlugin;

class GlueApplicationDependencyProvider extends SprykerGlueApplicationDependencyProvider
{
    /**
     * @param \Spryker\Glue\GlueApplicationExtension\Dependency\Plugin\ResourceRelationshipCollectionInterface $resourceRelationshipCollection
     *
     * @return \Spryker\Glue\GlueApplicationExtension\Dependency\Plugin\ResourceRelationshipCollectionInterface
     */
    protected function getResourceRelationshipPlugins(
        ResourceRelationshipCollectionInterface $resourceRelationshipCollection
    ): ResourceRelationshipCollectionInterface {
        $resourceRelationshipCollection->addRelationship(
            CheckoutRestApiConfig::RESOURCE_CHECKOUT_DATA,
            new PaymentMethodsByCheckoutDataResourceRelationshipPlugin()
        );

        return $resourceRelationshipCollection;
    }
}

<?php

namespace Pyz\Zed\CheckoutRestApi;

use Spryker\Zed\CheckoutRestApi\CheckoutRestApiDependencyProvider as SprykerCheckoutRestApiDependencyProvider;
use Spryker\Zed\PaymentsRestApi\Communication\Plugin\CheckoutRestApi\PaymentsQuoteMapperPlugin;

class CheckoutRestApiDependencyProvider extends SprykerCheckoutRestApiDependencyProvider
{
    /**
     * @return \Spryker\Zed\CheckoutRestApiExtension\Dependency\Plugin\QuoteMapperPluginInterface[]
     */
    protected function getQuoteMapperPlugins(): array
    {
        return [
            new PaymentsQuoteMapperPlugin(),
        ];
    }
}

<?php

namespace Pyz\Glue\CheckoutRestApi;

use Spryker\Glue\CheckoutRestApi\CheckoutRestApiDependencyProvider as SprykerCheckoutRestApiDependencyProvider;
use Spryker\Glue\PaymentsRestApi\Plugin\CheckoutRestApi\SelectedPaymentMethodCheckoutDataResponseMapperPlugin;

class CheckoutRestApiDependencyProvider extends SprykerCheckoutRestApiDependencyProvider
{
    /**
     * @return \Spryker\Glue\CheckoutRestApiExtension\Dependency\Plugin\CheckoutDataResponseMapperPluginInterface[]
     */
    protected function getCheckoutDataResponseMapperPlugins(): array
    {
        return [
            new SelectedPaymentMethodCheckoutDataResponseMapperPlugin(),
        ];
    }
}