//要引入文件地址  https://gitee.com/zzl_index/wechat-refund.git

//微信退款
public function ref_money($id)
{
    $param = $this->request->param();
    //订单ID
    if(!isset($param['id']) ||  empty($param['id'])){
        return api_error('ID不能为空');
    }

   //业务操作

    //调用退款
    $appid =  config('jwt.app_id');
    $mchid =  config('jwt.mchid');
    $apiKey = config('jwt.key');
    $reval = new Wxrefund($mchid,$appid,$apiKey);
    $do_refund = $reval->chrefund($order_no,$price,$price);
    if($do_refund == 1){
       return  1;//成功
    }else{
       return  0;//失败
    }
}