Asynchronous notification and verification order method of calling SDK after payment in WeChat applet

The following is a WeChat applet that uses the SDK’s asynchronous notification and verification method to process orders after payment. It has a good reference value and I hope it will be helpful to everyone

Asynchronous verification and order processing after the applet

<?php
/**
 * Created by YuanPan.
 * User: YuanPan
 * Date: 2017/12/21
 * Time: 15:15
 */

namespace app\api\service;

use app\api\model\Product;
use app\lib\enum\OrderStatusEnum;
use think\Db;
use think\Exception;
use think\Loader;
use app\api\model\Order;

//在这里依然引入WxPay.API.php即可完成引入
Loader::import(&#39;WxPay.WxPay&#39;,EXTEND_PATH,&#39;.Api.php&#39;);

class WxNotify extends \WxPayNotify
{
  //继承了父类，所以直接重写方法
  public function NotifyProcess($data, &$msg)
  {
    //如果返回支付成功信息
    if($data[&#39;return_code&#39;] = &#39;SUCCESS&#39;){
      $orderNo = $data[&#39;out_trade_no&#39;];
      Db::startTrans();
      try
      {
        //判断订单状态
        //在这里可以进行对数据库进行所机制
        //简单说，当一个执行sql语句的事务想要操作表记录之前，先向数据库发出请求，对你访问的记录集加锁
        //在这个事务释放这个锁之前，其他事务不能对这些数据进行更新操作
        Order::where([&#39;order_no&#39;=>$orderNo])->lock(true)->find();
//        $order = Order::get([&#39;order_no&#39;=>$orderNo]);
        //如果未支付
        if ($order->status == 1) {
          $service = new \app\api\service\Order();
          //查询到该订单号的商品和库存量信息
          $stockStatus = $service->checkOrderStock($order->id);
          //如果库存量有，更新订单状态，以及减去商品库存
          if ($stockStatus[&#39;pass&#39;]) {
            $this->updateOrderStatus($order->id, true);
            $this->reduceStock($stockStatus);
            //如果没有库存，订单状态修改为已支付，但订单未处理
          } else {
            $this->updateOrderStatus($order->id, false);
          }
        }
        Db::commit();
        //返回给微信
        return true;
      }catch (Exception $e){
        Db::rollback();
        return fasle;
      }
    }else{
      //如果微信返回失败的处理信息，那我们这里依然返回true，向微信表明态度
      return true;
    }
  }

  //支付成功，减去商品库存
  private function reduceStock($stockStatus)
  {
    //遍历减去
    foreach ($stockStatus[&#39;pStatusArray&#39;] as $v) {
      //使用tp5的setDec方法
      Product::where([&#39;id&#39;=>$v[&#39;id&#39;]])->setDec(&#39;stock&#39;,$v[&#39;count&#39;]);
    }
  }

  //success为真，则订单修改为PAID，如果为假则修改为已支付，但订单未处理的状态，对应枚举信息修改
  private function updateOrderStatus($orderID,$success)
  {
    $status = $success?OrderStatusEnum::PAID:OrderStatusEnum::PAID_BUT_OUT_OF;
    Order::where([&#39;id&#39;=>$orderID])->update([&#39;status&#39;=>$status]);
  }
}

The controller is as follows:

  public function receiveNotify()
  {
    //1：检查库存量防止超卖
    //2：更新status状态
    //3：减库存
    //如果成功处理，返回成功处理信息，否则返回没有成功处理信息
    $notify = new WxNotify();
    $notify->handle();
  }

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