RefundOrderInterface.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Sales\Model\Order\Validation;

use Magento\Sales\Api\Data\CreditmemoInterface;
use Magento\Sales\Api\Data\OrderInterface;
use Magento\Sales\Model\ValidatorResultInterface;

/**
 * Interface RefundOrderInterface
 *
 * @api
 * @since 100.1.3
 */
interface RefundOrderInterface
{
    /**
     * @param OrderInterface $order
     * @param CreditmemoInterface $creditmemo
     * @param array $items
     * @param bool $notify
     * @param bool $appendComment
     * @param \Magento\Sales\Api\Data\CreditmemoCommentCreationInterface|null $comment
     * @param \Magento\Sales\Api\Data\CreditmemoCreationArgumentsInterface|null $arguments
     * @return ValidatorResultInterface
     * @since 100.1.3
     */
    public function validate(
        OrderInterface $order,
        CreditmemoInterface $creditmemo,
        array $items = [],
        $notify = false,
        $appendComment = false,
        \Magento\Sales\Api\Data\CreditmemoCommentCreationInterface $comment = null,
        \Magento\Sales\Api\Data\CreditmemoCreationArgumentsInterface $arguments = null
    );
}