Magento 2 - Webhook

OrderConverter.php

<?php

declare(strict_types=1);

namespace Vendor\Namespace\Model\Converter;

use MageHook\Hook\Model\ConverterInterface;

/**
 * Class OrderConverter
 *
 * @package Vendor\Namespace\Model\Converter
 */
class OrderConverter implements ConverterInterface
{
    public function convert(array $data): array
    {
        $data['entry'] = true;
        
        return $data;
    }
}

OrderStateChangeValidator.php

<?php

declare(strict_types=1);

namespace MageHook\HookEventsSales\Event\Options;

use MageHook\Hook\Event\Options\AbstractValidator;

/**
 * Class OrderStateChangeValidator
 *
 * @package Vendor\Namespace\Event\Options
 */
class OrderStateChangeValidator extends AbstractValidator
{
    /**
     * @inheritdoc
     */
    public function validate(): bool
    {
        /** @var OrderInterface $order */
        $order = $this->getResource();
        
        return $order->getTotalItemCount() !== 0;
    }
}

webhooks.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:MageHook_Hook/etc/webhooks.xsd">
  <hook event="order_state_change"
        title="Order State Change"
        group="Sales"
        service="Magento\Sales\Api\Data\OrderInterface"
        converter="Vendor\Namespace\Model\Converter\OrderConverter"
        validator="Vendor\Namespace\Event\Options\OrderStateChangeValidator"/>
</config>