ExtensionAttributesInterface.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Magento\Framework\Api;

/**
 * Marker interface for all extension attributes interfaces.
 *
 * @api
 * @since 100.0.2
 */
interface ExtensionAttributesInterface
{
}