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

<?php
namespace refill\shantong;

class config
{
    const ORDER_URL = 'http://wf-recharge-api.shantongdata.com/api/v1/mobile/order/apply';
    const QUERY_URL = 'http://wf-recharge-api.shantongdata.com/api/v1/mobile/order/query';
    const BALANCE_URL = 'http://wf-recharge-api.shantongdata.com/api/v1/agent/balance/enquiry';

    const AGENT_ID = '1004';
    const transactionPin = 'Qwer@1234';
    const APP_ID = 'cz_1004';
    const APP_KEY = '3c7795c7-beb3-45fc-b764-98c270062c90';
    const NOTIFY_URL = BASE_SITE_URL . "/mobile/callback/refill_shantong.php";
    const ExtHeaders = ['Content-Type: application/json;charset=UTF-8'];

    private static function createNoncestr( $length = 32 )
    {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ )  {
            $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }

    public static function pub_params()
    {
        $params['appId'] = config::APP_ID;
        $params['nonceStr'] = self::createNoncestr();
        $params['timeStamp'] = time();

        return $params;
    }

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

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

        return false;
    }
}