xyzshop/helper/refill/api/xyz/quanzhen_hf_man/config.php

<?php
namespace refill\quanzhen_hf_man;

use mtopcard;
class config
{
    const ORDER_URL = 'http://payapi.eyunpay.com/open/api/hf/recharge';
    const QUERY_URL = 'http://payapi.eyunpay.com/open/api/hf/query';
    const BALANCE_URL = 'http://payapi.eyunpay.com/open/api/hf/queryFee';

    const APP_ID = 'wp1685346685673';
    const APP_KEY = 'wiXM7vVCBiO9rw3nvQE8NWwn17NFXrok';
    const NOTIFY_URL = BASE_SITE_URL . "/mobile/callback/refill_quanzhen_hf_man.php";

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

    const operator = [
        mtopcard\ChinaMobileCard  => '1',
        mtopcard\ChinaUnicomCard  => '2',
        mtopcard\ChinaTelecomCard => '3'
    ];

    public static function sign($params)
    {
        ksort($params);
        $content = '';
        foreach ($params as $key => $value) {
            $content .= "{$key}={$value}&";
        }
        $content .= 'key='.config::APP_KEY;
        return md5($content);
    }
}