PHP 之建行龙支付 - 退款

完整建行支付
建行主扫支付：https://blog.youkuaiyun.com/weixin_42674576/article/details/122010126?spm=1001.2014.3001.5501
建行被扫支付：https://blog.youkuaiyun.com/weixin_42674576/article/details/122380110?spm=1001.2014.3001.5501
被扫支付查单：https://blog.youkuaiyun.com/weixin_42674576/article/details/122380365?spm=1001.2014.3001.5501

直接上代码

<?php


namespace service\ccb;

use app\util\HttpUtil;

class RefundService
{
   
   
    public function refund($input){
   
   
        $publicParam = config('ccb.public');
        
		$refundNo = $input['refundNo']<