public function pay(Request $rst){
		$url	= ‘http://xxx.com/index/pay/payNotify‘;  //你的微信支付回调域名
		$ch = curl_init($url);
		curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
		curl_setopt($ch, CURLOPT_POSTFIELDS,‘你的XML数据（从第一次支付成功保存到数据库或者日志里查看‘);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
		curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type:text/xml; charset=utf-8"));
		$result = curl_exec($ch);   // 抓取URL并把它传递给浏览器
		exit($result);
	}

php 测试微信回调方法