xyzshop/helper/refill/api/xyz/rsanfang/RefillCallBack.php

<?php
namespace refill\rsanfang;

require_once(BASE_HELPER_RAPI_PATH . '/rsanfang/config.php');

use refill;
class RefillCallBack implements refill\IRefillCallBack
{
    public function verify($params): bool
    {
        $sign = $this->sign($params);
        if ($params['sign'] == $sign) {
            return true;
        } else {
            return false;
        }
    }

    private function sign($params): string
    {
        $content = "";
        return strtoupper(md5($content));
    }

    public function notify($params): array
    {
        $order_id = '';
        $official_sn = '';
        return [$order_id, true, false, true, $official_sn];
    }
}