Payum Extension to allows GiftCard with SyliusPayumStripePlugin

CheckCouponsExtension.php

<?php

declare(strict_types=1);

namespace App\GiftCard\Payum\Extension;

use FluxSE\PayumStripe\Request\Api\Resource\CreateCoupon;
use FluxSE\PayumStripe\Request\Api\Resource\RetrieveCoupon;
use FluxSE\SyliusPayumStripePlugin\Action\ConvertPaymentAction;
use Payum\Core\Extension\Context;
use Payum\Core\Extension\ExtensionInterface;
use Payum\Core\Request\Convert;
use Stripe\Exception\ApiErrorException;
use Sylius\Component\Core\Model\PaymentInterface;

/**
 * Payum extension to create coupon on Stripe while using the SyliusGiftCardPlugin
 * This extension need a decoration of the DetailsProvider to add coupon IDs
 * to the "discounts" new array member
 */
final class CheckCouponsExtension implements ExtensionInterface
{
    public function onPreExecute(Context $context)
    {
    }

    public function onExecute(Context $context)
    {
    }

    public function onPostExecute(Context $context)
    {
        if ($context->getException()) {
            return;
        }

        if (false === $context->getAction() instanceof ConvertPaymentAction) {
            return;
        }

        /** @var mixed|Convert $request */
        $request = $context->getRequest();
        if (false === $request instanceof Convert) {
            return;
        }

        /** @var mixed|PaymentInterface $payment */
        $payment = $request->getSource();
        if (false === $payment instanceof PaymentInterface) {
            return;
        }

        $order = $payment->getOrder();
        if (null === $order) {
            return;
        }

        $gateway = $context->getGateway();
        foreach ($order->getGiftCardOrders() as $giftCardOrder) {
            $giftCard = $giftCardOrder->getGiftCard();
            $couponId = sprintf('GIFT_CARD_%s', $giftCard->getCode());
            $retrieveCouponRequest = new RetrieveCoupon($couponId);

            try {
                $gateway->execute($retrieveCouponRequest);
            } catch (ApiErrorException $e) {
                $createCouponRequest = new CreateCoupon([
                    'id' => $couponId,
                    'amount_off' => $giftCard->getAmount() / 100,
                    'currency' => $order->getCurrencyCode(),
                    'metadata' => [
                        'SYLIUS_GIFTCARD_ID' => $giftCard->getId(),
                        'SYLIUS_GIFTCARD_CODE' => $giftCard->getCode(),
                    ],
                    'name' => sprintf('Gift card #%d', $giftCard->getId()),
                ]);
                $gateway->execute($createCouponRequest);
            }
        }
    }
}