This time I will bring you the development of MVC using WeChat scan code to pay. Asp.Net MVC development and the development of Asp.Net MVC using WeChat scan code to pay. What are the precautions? The following is the actual combat. Let’s take a look at the case.

The scan code payment here refers to the use of WeChat payment on the PC website, which is the official mode two. The website is Asp.net MVC, which is organized as follows. (Demo is at the bottom)

1.

Preparation work

The unified order method in the WeChat API used, the key parameter is'

public account ID (appid)', 'merchant number (mch_id)' and 'merchant payment key (KEY)', so you must first have an approved public account, and Activate the payment function, then apply for a merchant. After passing the review, you will get the merchant number, which is the login name of the merchant platform. The merchant payment key is used for signing to ensure that the URL is not tampered with. After entering the merchant platform, set it in API security. It is a 32-bit string .

After having these three parameters, there is another thing to note:

Transaction starting time and Transaction ending time The interval should be more than five minutes and less than 2 hours. Otherwise, an error will be reported when obtaining the payment URL.

2. Generate payment QR code

With the above parameters, the next step is to download the SDK: .net SDK and examples.

Unfortunately, this official example did not run correctly at first. Reference the relevant dll to the MVC directory. And create a WxPayAPI folder and copy the relevant classes over.

Then set the relevant parameters in

WxPayConfig to your own parameters, and then modify the GetPayUrl method,

?public?string?GetPayUrl(Order?order,string?ip)
????????{????????????if?(order?==?null)
????????????{????????????????throw?new?ArgumentNullException("order");
????????????}???????????
????????????var?product?=?order.OrderItems.First();
????????????WxPayData?data?=?new?WxPayData();
????????????data.SetValue("appid",?WxPayConfig.APPID);
????????????data.SetValue("mch_id",?WxPayConfig.MCHID);????????????//?data.SetValue("device_info",?"iphone4s");
????????????data.SetValue("nonce_str",?WxPayApi.GenerateNonceStr());
????????????data.SetValue("body",?product.AttributeDescription);//商品描述
????????????data.SetValue("detail",?product.AttributeDescription);//商品描述
????????????data.SetValue("attach",?"北京分店");//附加數(shù)據(jù)
????????????data.SetValue("out_trade_no",?order.TradeNumber);//隨機(jī)字符串???????????//?data.SetValue("total_fee",?Convert.ToInt32(order.OrderTotal?*?100));//總金額
????????????data.SetValue("total_fee",?1);//總金額
????????????data.SetValue("spbill_create_ip",ip);//總金額
????????????data.SetValue("time_start",?DateTime.Now.ToString("yyyyMMddHHmmss"));//交易起始時間
????????????data.SetValue("time_expire",?DateTime.Now.AddMinutes(30).ToString("yyyyMMddHHmmss"));//交易結(jié)束時間
????????????data.SetValue("goods_tag",?"智能嬰兒床");//商品標(biāo)記
????????????data.SetValue("notify_url",?"http://www.xxxx.com/Checkout/ResultNotify");//通知地址
????????????data.SetValue("trade_type",?"NATIVE");//交易類型
????????????data.SetValue("product_id",?product.ProductId);//商品ID??
????????????data.SetValue("sign",?data.MakeSign());//簽名
????????????Logger.Info("獲得簽名"?+?data.GetValue("sign"));
????????????WxPayData?result?=?WxPayApi.UnifiedOrder(data);//調(diào)用統(tǒng)一下單接口????????????Logger.Info(result.ToJson());????????????string?url?=?result.GetValue("code_url").ToString();//獲得統(tǒng)一下單接口返回的二維碼鏈接
????????????Logger.Info("pay?url:"?+?url);????????????return?url;
????????}

TradeNumber It is generated by calling the WxPayApi.GenerateOutTradeNo() method. notify_url is the address of WeChat notification after the user pays. The unit of the amount is cents, which can only be passed in int type or string type. Decimal needs to be converted. After successfully obtaining the url, create a payment method in the

controller responsible for payment. Used to display QR codes:

??ActionResult?Payment((??ArgumentException(?order?=?_orderService.GetOrderByGuid(?user?==??url2?==??+=

Here just returns a url, on the page:

<img src="@ViewBag.QRCode" class="qrcode"  />

The qrCodeEncoder used in the background generates QR codes.

??public?FileResult?MakeQRCode(string?data)
????????{????????????if?(string.IsNullOrEmpty(data))?
????????????????throw?new?ArgumentException("data");????????????//初始化二維碼生成工具
????????????QRCodeEncoder?qrCodeEncoder?=?new?QRCodeEncoder();
????????????qrCodeEncoder.QRCodeEncodeMode?=?QRCodeEncoder.ENCODE_MODE.BYTE;
????????????qrCodeEncoder.QRCodeErrorCorrect?=?QRCodeEncoder.ERROR_CORRECTION.M;
????????????qrCodeEncoder.QRCodeVersion?=?0;
????????????qrCodeEncoder.QRCodeScale?=?4;????????????//將字符串生成二維碼圖片
????????????Bitmap?image?=?qrCodeEncoder.Encode(data,?Encoding.Default);????????????//保存為PNG到內(nèi)存流??
????????????MemoryStream?ms?=?new?MemoryStream();
????????????image.Save(ms,?ImageFormat.Jpeg);????????????return?File(ms.ToArray(),?"image/jpeg");
????????}

After success, you will get the payment page:

After scanning the QR code, the payment page will pop up:

3. Callback

After the user pays, WeChat will send a message to the previously reserved interface (the interface cannot take parameters). The website will verify and confirm after receiving the message, and then send a message to WeChat after confirmation. For detailed parameters and documents, please see the official API

Here we have slightly modified the method in the demo and put it into the controller:

??public?ActionResult?ResultNotify()
????????{????????????//接收從微信后臺POST過來的數(shù)據(jù)
????????????Stream?s?=?Request.InputStream;????????????int?count?=?0;????????????byte[]?buffer?=?new?byte[1024];
????????????StringBuilder?builder?=?new?StringBuilder();????????????while?((count?=?s.Read(buffer,?0,?1024))?>?0)
????????????{
????????????????builder.Append(Encoding.UTF8.GetString(buffer,?0,?count));
????????????}
????????????s.Flush();
????????????s.Close();
????????????s.Dispose();
????????????Logger.Info(this.GetType()+?"Receive?data?from?WeChat?:?"?+?builder);????????????//轉(zhuǎn)換數(shù)據(jù)格式并驗(yàn)證簽名
????????????WxPayData?data?=?new?WxPayData();????????????try
????????????{
????????????????data.FromXml(builder.ToString());
????????????}????????????catch?(WxPayException?ex)
????????????{????????????????//若簽名錯誤，則立即返回結(jié)果給微信支付后臺
????????????????WxPayData?res?=?new?WxPayData();
????????????????res.SetValue("return_code",?"FAIL");
????????????????res.SetValue("return_msg",?ex.Message);
????????????????Log.Error(this.GetType().ToString(),?"Sign?check?error?:?"?+?res.ToXml());
????????????????Response.Write(res.ToXml());
????????????????Response.End();
????????????}
????????????Logger.Info(this.GetType()+?"Check?sign?success");
????????????ProcessNotify(data);????????????return?View();
????????}????????public?void?ProcessNotify(WxPayData?data)
????????{
????????????WxPayData?notifyData?=?data;????????????//檢查支付結(jié)果中transaction_id是否存在
????????????if?(!notifyData.IsSet("transaction_id"))
????????????{????????????????//若transaction_id不存在，則立即返回結(jié)果給微信支付后臺
????????????????WxPayData?res?=?new?WxPayData();
????????????????res.SetValue("return_code",?"FAIL");
????????????????res.SetValue("return_msg",?"支付結(jié)果中微信訂單號不存在");
????????????????Logger.Error(this.GetType()+"The?Pay?result?is?error?:?"?+?res.ToXml());
????????????????Response.Write(res.ToXml());
????????????????Response.End();
????????????}????????????string?transaction_id?=?notifyData.GetValue("transaction_id").ToString();????????????//查詢訂單，判斷訂單真實(shí)性
????????????if?(!QueryOrder(transaction_id))
????????????{????????????????//若訂單查詢失敗，則立即返回結(jié)果給微信支付后臺
????????????????WxPayData?res?=?new?WxPayData();
????????????????res.SetValue("return_code",?"FAIL");
????????????????res.SetValue("return_msg",?"訂單查詢失敗");
????????????????Logger.Error(this.GetType()+"Order?query?failure?:?"?+?res.ToXml());
????????????????Response.Write(res.ToXml());
????????????????Response.End();
????????????}????????????//查詢訂單成功
????????????else
????????????{
????????????????WxPayData?res?=?new?WxPayData();
????????????????res.SetValue("return_code",?"SUCCESS");
????????????????res.SetValue("return_msg",?"OK");
????????????????Logger.Info(this.GetType()+"order?query?success?:?"?+?res.ToXml());????????????????SetPaymentResult(data.GetValue("out_trade_no").ToString(),?PaymentStatus.Paid);
????????????????Response.Write(res.ToXml());
????????????????Response.End();
????????????}
????????}

After receiving the confirmation, we need to update the status of the order:

??public?void?SetPaymentResult(string?tradeno,?PaymentStatus?status)
????????{
????????????Logger.Info("訂單號:"+tradeno);????????????var?order?=?_orderService.GetOrderByTradeNumber(tradeno);????????????if?(order?!=?null)
????????????{
????????????????order.PaymentStatus?=?status;????????????????if?(status?==?PaymentStatus.Paid)
????????????????{
????????????????????order.PaidDate?=?DateTime.Now;
????????????????}
????????????????_orderService.UpdateOrder(order);
????????????????Logger.Info("訂單："+tradeno+"成功更新狀態(tài)為"+status);
????????????}
????????}

Then check the status of the order on the page. After confirming success, jump to the page.

In the background of the merchant platform, we can query:

I believe you have mastered it after reading the case in this article Method, for more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Development of refund function for WeChat payment

##Detailed explanation of H5’s video playback library video.js

WeChat Hardware H5 Development Controlling Lights

Easy-to-use lightweight date plug-in in JS

The above is the detailed content of Asp.Net MVC development for WeChat scan code payment. For more information, please follow other related articles on the PHP Chinese website!