yanzong/app/api/service/statistics/RefundData.php

<?php

namespace app\api\service\statistics;

use app\api\model\OrderRefund;
use app\common\service\BaseService;

class RefundData extends BaseService
{
    protected OrderRefund $refundModel;

    public function initialize()
    {
        parent::initialize(); // TODO: Change the autogenerated stub
        $this->refundModel = new OrderRefund();
    }

    public function getRefundData($startDate = null, $endDate = null): array
    {
        return [
            'refundCount' => 0,
            'refundTotalMoney' => 0
        ];
    }
}