xyzshop/helper/refill/api/yl/binyu/config.php

<?php
namespace refill\binyu;

class config
{
    //https://docs.qq.com/doc/DZU9xSUhXYVBNRXhj
    const ORDER_URL = 'https://phone.shanghaibinyu.top/api/charge';
    const QUERY_URL = 'https://phone.shanghaibinyu.top/api/query';
    const BALANCE_URL = 'https://phone.shanghaibinyu.top/api/balance';

    const MCH_ID = '4';
    const SECRET_KEY = '781b78f0cc0817afab0e017cbb314308';
    const NOTIFY_URL = BASE_SITE_URL . "/mobile/callback/refill_binyu.php";

    const ExtHeaders = ['Content-Type: application/json'];

    public static function sign($params)
    {
        ksort($params);
        $content = '';
        foreach ($params as $key => $value) {
            if(self::check_empty($value) === false) {
                $content .= "{$key}={$value}&";
            }
        }
        $content .= 'secret_key=' . config::SECRET_KEY;
        return md5(md5($content));
    }

    public static function check_empty($value)
    {
        if (!isset($value))
            return true;
        if ($value === null)
            return true;
        if (trim($value) === "")
            return true;

        return false;
    }
}