Perfect Day in Magento 2 anbinden.

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_order_payment_pay">
        <observer name="pfd_order_paid"
                  instance="DigElite\PerfectDayConnector\Observer\OrderPaidObserver"/>
    </event>
</config>

<?php
namespace DigElite\PerfectDayConnector\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer;
use Magento\Framework\HTTP\Client\Curl;

class OrderPaidObserver implements ObserverInterface
{
    private const PFD_USER = 'DEIN-USER';
    private const PFD_PWD  = 'xxxx xxxx xxxx xxxx xxxx xxxx';
    private const PFD_URL  = 'https://plattform.deinperfectday.de/wp-json/perfectday/shop/webhook/order';

    public function __construct(private Curl $curl) {}

    public function execute(Observer $observer): void
    {
        $order = $observer->getEvent()->getPayment()->getOrder();
        if (!$order) return;

        $items = [];
        foreach ($order->getAllItems() as $it) {
            $couponId = (int) $it->getProduct()->getData('pfd_coupon_id');
            if ($couponId <= 0) continue;
            $items[] = ['coupon_id' => $couponId, 'count' => (int)$it->getQtyOrdered()];
        }
        if (empty($items)) return;

        $payload = [
            'shop_order_id' => (string) $order->getIncrementId(),
            'shop_type'     => 'magento',
            'shop_domain'   => parse_url($order->getStore()->getBaseUrl(), PHP_URL_HOST),
            'customer' => [
                'email'  => $order->getCustomerEmail(),
                'name'   => trim($order->getCustomerFirstname() . ' ' . $order->getCustomerLastname()),
                'locale' => substr($order->getStore()->getLocaleCode() ?: 'de', 0, 2),
            ],
            'items'             => $items,
            'order_total_cents' => (int) round((float) $order->getGrandTotal() * 100),
            'currency'          => $order->getOrderCurrencyCode(),
            'placed_at'         => $order->getCreatedAt(),
        ];

        $this->curl->setHeaders([
            'Content-Type'  => 'application/json',
            'Authorization' => 'Basic ' . base64_encode(self::PFD_USER . ':' . self::PFD_PWD),
        ]);
        $this->curl->post(self::PFD_URL, json_encode($payload));
    }
}