请教下ios 内购自动订阅的技术细节

        $receipts = $data['latest_receipt_info']; // 自动续订订阅项时才会有
        if (!isset($data['latest_receipt_info'])) {
            $receipts = $data['receipt']['in_app']; // 消费类型
        }
        if (empty($receipts)) {
            return api_400('in_app信息为空');
        }
        //根据自身需求返回数据
        $returnData = [];
        //多物品信息
        foreach ($receipts as $product) {
            //订单重复验证
            $orderCheck = PaymentOrderModel::where(['otn' => $product['transaction_id']])
                ->find();
            if ($orderCheck) {
                continue;
            }
            //产品验证
            $productCheck = ProductModel::where(['os_type' => 1, 'ename' => $product['product_id']])
                ->find();
            if (!$productCheck) {
                return api_400('没有找到对应产品的金额,ID:' . $product['product_id']);
            }
            // 启动事务
            Db::startTrans();
            try {
                //创建订单
                //业务处理
                Db::commit();
                // 提交事务
            } catch (\Exception $e) {
                // 回滚事务
                Db::rollback();
                return api_400($e->getMessage());
            }

        }Copy