private static readonly ILog log =
              LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
            protected void Page_Load(object sender, EventArgs e)
            {
                
                
                if (!IsPostBack)
                {
                    txtOrderDesc.Text = "Nhap noi dung thanh toan";
                    txtExpire.Text = DateTime.Now.AddMinutes(15).ToString("yyyyMMddHHmmss");
    
                }
            }
    
            protected void btnPay_Click(object sender, EventArgs e)
            {
                //Get Config Info
                string vnp_Returnurl = ConfigurationManager.AppSettings["vnp_Returnurl"]; //URL nhan ket qua tra ve 
                string vnp_Url = ConfigurationManager.AppSettings["vnp_Url"]; //URL thanh toan cua VNPAY 
                string vnp_TmnCode = ConfigurationManager.AppSettings["vnp_TmnCode"]; //Ma website
                string vnp_HashSecret = ConfigurationManager.AppSettings["vnp_HashSecret"]; //Chuoi bi mat
                if (string.IsNullOrEmpty(vnp_TmnCode) || string.IsNullOrEmpty(vnp_HashSecret))
                {
                    lblMessage.Text = "Vui lòng cấu hình các tham số: vnp_TmnCode,vnp_HashSecret trong file web.config";
                    return;
                }
                //Get payment input
                OrderInfo order = new OrderInfo();
                //Save order to db
                order.OrderId = DateTime.Now.Ticks; // Giả lập mã giao dịch hệ thống merchant gửi sang VNPAY
                order.Amount = 100000; // Giả lập số tiền thanh toán hệ thống merchant gửi sang VNPAY 100,000 VND
                order.Status = "0"; //0: Trạng thái thanh toán "chờ thanh toán" hoặc "Pending"
                order.OrderDesc = txtOrderDesc.Text;
                order.CreatedDate = DateTime.Now;
                string locale = cboLanguage.SelectedItem.Value;
                //Build URL for VNPAY
                VnPayLibrary vnpay = new VnPayLibrary();
    
                vnpay.AddRequestData("vnp_Version", VnPayLibrary.VERSION);
                vnpay.AddRequestData("vnp_Command", "pay");
                vnpay.AddRequestData("vnp_TmnCode", vnp_TmnCode);
                vnpay.AddRequestData("vnp_Amount", (order.Amount * 100).ToString()); //Số tiền thanh toán. Số tiền không 
                mang các ký tự phân tách thập phân, phần nghìn, ký tự tiền tệ. Để gửi số tiền thanh toán là 100,000 VND 
                (một trăm nghìn VNĐ) thì merchant cần nhân thêm 100 lần (khử phần thập phân), sau đó gửi sang VNPAY 
                là: 10000000
                if (cboBankCode.SelectedItem != null && !string.IsNullOrEmpty(cboBankCode.SelectedItem.Value))
                {
                    vnpay.AddRequestData("vnp_BankCode", cboBankCode.SelectedItem.Value);
                }
                vnpay.AddRequestData("vnp_CreateDate", order.CreatedDate.ToString("yyyyMMddHHmmss"));
                vnpay.AddRequestData("vnp_CurrCode", "VND");
                vnpay.AddRequestData("vnp_IpAddr", Utils.GetIpAddress());
                if (!string.IsNullOrEmpty(locale))
                {
                    vnpay.AddRequestData("vnp_Locale", locale);
                }
                else
                {
                    vnpay.AddRequestData("vnp_Locale", "vn");
                }
                vnpay.AddRequestData("vnp_OrderInfo", "Thanh toan don hang:" + order.OrderId);
                vnpay.AddRequestData("vnp_OrderType", orderCategory.SelectedItem.Value); //default value: other
                vnpay.AddRequestData("vnp_ReturnUrl", vnp_Returnurl);
                vnpay.AddRequestData("vnp_TxnRef", order.OrderId.ToString()); // Mã tham chiếu của giao dịch tại hệ 
                thống của merchant. Mã này là duy nhất dùng để phân biệt các đơn hàng gửi sang VNPAY. Không được 
                trùng lặp trong ngày
                //Add Params of 2.1.0 Version
                vnpay.AddRequestData("vnp_ExpireDate",txtExpire.Text);
                //Billing
                vnpay.AddRequestData("vnp_Bill_Mobile", txt_billing_mobile.Text.Trim());
                vnpay.AddRequestData("vnp_Bill_Email", txt_billing_email.Text.Trim());
                var fullName = txt_billing_fullname.Text.Trim();
                if (!String.IsNullOrEmpty(fullName))
                {
                    var indexof = fullName.IndexOf(' ');
                    vnpay.AddRequestData("vnp_Bill_FirstName", fullName.Substring(0, indexof));
                    vnpay.AddRequestData("vnp_Bill_LastName", fullName.Substring(indexof + 1, 
                    fullName.Length - indexof - 1));
                }
                vnpay.AddRequestData("vnp_Bill_Address", txt_inv_addr1.Text.Trim());
                vnpay.AddRequestData("vnp_Bill_City", txt_bill_city.Text.Trim());
                vnpay.AddRequestData("vnp_Bill_Country", txt_bill_country.Text.Trim());
                vnpay.AddRequestData("vnp_Bill_State", "");
                // Invoice
                vnpay.AddRequestData("vnp_Inv_Phone", txt_inv_mobile.Text.Trim());
                vnpay.AddRequestData("vnp_Inv_Email", txt_inv_email.Text.Trim());
                vnpay.AddRequestData("vnp_Inv_Customer", txt_inv_customer.Text.Trim());
                vnpay.AddRequestData("vnp_Inv_Address", txt_inv_addr1.Text.Trim());
                vnpay.AddRequestData("vnp_Inv_Company", txt_inv_company.Text);
                vnpay.AddRequestData("vnp_Inv_Taxcode", txt_inv_taxcode.Text);
                vnpay.AddRequestData("vnp_Inv_Type", cbo_inv_type.SelectedItem.Value);
    
                string paymentUrl = vnpay.CreateRequestUrl(vnp_Url, vnp_HashSecret);
                log.InfoFormat("VNPAY URL: {0}", paymentUrl);
                Response.Redirect(paymentUrl);
            }
            // vui lòng tham khảo thêm tại code demo
            

    def payment(request):
        if request.method == 'POST':
            # Process input data and build url payment
            form = PaymentForm(request.POST)
            if form.is_valid():
                order_type = form.cleaned_data['order_type']
                order_id = form.cleaned_data['order_id']
                amount = form.cleaned_data['amount']
                order_desc = form.cleaned_data['order_desc']
                bank_code = form.cleaned_data['bank_code']
                language = form.cleaned_data['language']
                ipaddr = get_client_ip(request)
                # Build URL Payment
                vnp = vnpay()
                vnp.requestData['vnp_Version'] = '2.1.0'
                vnp.requestData['vnp_Command'] = 'pay'
                vnp.requestData['vnp_TmnCode'] = settings.VNPAY_TMN_CODE
                vnp.requestData['vnp_Amount'] = amount * 100
                vnp.requestData['vnp_CurrCode'] = 'VND'
                vnp.requestData['vnp_TxnRef'] = order_id
                vnp.requestData['vnp_OrderInfo'] = order_desc
                vnp.requestData['vnp_OrderType'] = order_type
                # Check language, default: vn
                if language and language != '':
                    vnp.requestData['vnp_Locale'] = language
                else:
                    vnp.requestData['vnp_Locale'] = 'vn'
                    # Check bank_code, if bank_code is empty, customer will be selected bank on VNPAY
                if bank_code and bank_code != "":
                    vnp.requestData['vnp_BankCode'] = bank_code
    
                vnp.requestData['vnp_CreateDate'] = datetime.now().strftime('%Y%m%d%H%M%S')
                vnp.requestData['vnp_IpAddr'] = ipaddr
                vnp.requestData['vnp_ReturnUrl'] = settings.VNPAY_RETURN_URL
                vnpay_payment_url = vnp.get_payment_url(settings.VNPAY_PAYMENT_URL, settings.VNPAY_HASH_SECRET_KEY)
                print(vnpay_payment_url)
                    # Redirect to VNPAY
                    return redirect(vnpay_payment_url)
            else:
                print("Form input not validate")
        else:
            return render(request, "payment.html", {"title": "Thanh toán"})
            // vui lòng tham khảo thêm tại code demo
            

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            String vnp_Version = "2.1.0";
            String vnp_Command = "pay";
            String vnp_OrderInfo = req.getParameter("vnp_OrderInfo");
            String orderType = req.getParameter("ordertype");
            String vnp_TxnRef = Config.getRandomNumber(8);
            String vnp_IpAddr = Config.getIpAddress(req);
            String vnp_TmnCode = Config.vnp_TmnCode;
    
            int amount = Integer.parseInt(req.getParameter("amount")) * 100;
            Map vnp_Params = new HashMap<>();
            vnp_Params.put("vnp_Version", vnp_Version);
            vnp_Params.put("vnp_Command", vnp_Command);
            vnp_Params.put("vnp_TmnCode", vnp_TmnCode);
            vnp_Params.put("vnp_Amount", String.valueOf(amount));
            vnp_Params.put("vnp_CurrCode", "VND");
            String bank_code = req.getParameter("bankcode");
            if (bank_code != null && !bank_code.isEmpty()) {
                vnp_Params.put("vnp_BankCode", bank_code);
            }
            vnp_Params.put("vnp_TxnRef", vnp_TxnRef);
            vnp_Params.put("vnp_OrderInfo", vnp_OrderInfo);
            vnp_Params.put("vnp_OrderType", orderType);
    
            String locate = req.getParameter("language");
            if (locate != null && !locate.isEmpty()) {
                vnp_Params.put("vnp_Locale", locate);
            } else {
                vnp_Params.put("vnp_Locale", "vn");
            }
            vnp_Params.put("vnp_ReturnUrl", Config.vnp_Returnurl);
            vnp_Params.put("vnp_IpAddr", vnp_IpAddr);
            Calendar cld = Calendar.getInstance(TimeZone.getTimeZone("Etc/GMT+7"));
    
            SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
            String vnp_CreateDate = formatter.format(cld.getTime());
    
            vnp_Params.put("vnp_CreateDate", vnp_CreateDate);
            cld.add(Calendar.MINUTE, 15);
            String vnp_ExpireDate = formatter.format(cld.getTime());
            //Add Params of 2.1.0 Version
            vnp_Params.put("vnp_ExpireDate", vnp_ExpireDate);
            //Billing
            vnp_Params.put("vnp_Bill_Mobile", req.getParameter("txt_billing_mobile"));
            vnp_Params.put("vnp_Bill_Email", req.getParameter("txt_billing_email"));
            String fullName = (req.getParameter("txt_billing_fullname")).trim();
            if (fullName != null && !fullName.isEmpty()) {
                int idx = fullName.indexOf(' ');
                String firstName = fullName.substring(0, idx);
                String lastName = fullName.substring(fullName.lastIndexOf(' ') + 1);
                vnp_Params.put("vnp_Bill_FirstName", firstName);
                vnp_Params.put("vnp_Bill_LastName", lastName);
    
            }
            vnp_Params.put("vnp_Bill_Address", req.getParameter("txt_inv_addr1"));
            vnp_Params.put("vnp_Bill_City", req.getParameter("txt_bill_city"));
            vnp_Params.put("vnp_Bill_Country", req.getParameter("txt_bill_country"));
            if (req.getParameter("txt_bill_state") != null && !req.getParameter("txt_bill_state").isEmpty()) {
                vnp_Params.put("vnp_Bill_State", req.getParameter("txt_bill_state"));
            }
            // Invoice
            vnp_Params.put("vnp_Inv_Phone", req.getParameter("txt_inv_mobile"));
            vnp_Params.put("vnp_Inv_Email", req.getParameter("txt_inv_email"));
            vnp_Params.put("vnp_Inv_Customer", req.getParameter("txt_inv_customer"));
            vnp_Params.put("vnp_Inv_Address", req.getParameter("txt_inv_addr1"));
            vnp_Params.put("vnp_Inv_Company", req.getParameter("txt_inv_company"));
            vnp_Params.put("vnp_Inv_Taxcode", req.getParameter("txt_inv_taxcode"));
            vnp_Params.put("vnp_Inv_Type", req.getParameter("cbo_inv_type"));
            //Build data to hash and querystring
            List fieldNames = new ArrayList(vnp_Params.keySet());
            Collections.sort(fieldNames);
            StringBuilder hashData = new StringBuilder();
            StringBuilder query = new StringBuilder();
            Iterator itr = fieldNames.iterator();
            while (itr.hasNext()) {
                String fieldName = (String) itr.next();
                String fieldValue = (String) vnp_Params.get(fieldName);
                if ((fieldValue != null) && (fieldValue.length() > 0)) {
                    //Build hash data
                    hashData.append(fieldName);
                    hashData.append('=');
                    hashData.append(URLEncoder.encode(fieldValue, StandardCharsets.US_ASCII.toString()));
                    //Build query
                    query.append(URLEncoder.encode(fieldName, StandardCharsets.US_ASCII.toString()));
                    query.append('=');
                    query.append(URLEncoder.encode(fieldValue, StandardCharsets.US_ASCII.toString()));
                    if (itr.hasNext()) {
                        query.append('&');
                        hashData.append('&');
                    }
                }
            }
            String queryUrl = query.toString();
            String vnp_SecureHash = Config.hmacSHA512(Config.vnp_HashSecret, hashData.toString());
            queryUrl += "&vnp_SecureHash=" + vnp_SecureHash;
            String paymentUrl = Config.vnp_PayUrl + "?" + queryUrl;
            com.google.gson.JsonObject job = new JsonObject();
            job.addProperty("code", "00");
            job.addProperty("message", "success");
            job.addProperty("data", paymentUrl);
            Gson gson = new Gson();
            resp.getWriter().write(gson.toJson(job));
        }
        //vui lòng tham khảo thêm tại code demo
        

    router.post('/create_payment_url', function (req, res, next) {
        var ipAddr = req.headers['x-forwarded-for'] ||
            req.connection.remoteAddress ||
            req.socket.remoteAddress ||
            req.connection.socket.remoteAddress;
    
        var config = require('config');
        var dateFormat = require('dateformat');
    
        
        var tmnCode = config.get('vnp_TmnCode');
        var secretKey = config.get('vnp_HashSecret');
        var vnpUrl = config.get('vnp_Url');
        var returnUrl = config.get('vnp_ReturnUrl');
    
        var date = new Date();
    
        var createDate = dateFormat(date, 'yyyymmddHHmmss');
        var orderId = dateFormat(date, 'HHmmss');
        var amount = req.body.amount;
        var bankCode = req.body.bankCode;
        
        var orderInfo = req.body.orderDescription;
        var orderType = req.body.orderType;
        var locale = req.body.language;
        if(locale === null || locale === ''){
            locale = 'vn';
        }
        var currCode = 'VND';
        var vnp_Params = {};
        vnp_Params['vnp_Version'] = '2.1.0';
        vnp_Params['vnp_Command'] = 'pay';
        vnp_Params['vnp_TmnCode'] = tmnCode;
        // vnp_Params['vnp_Merchant'] = ''
        vnp_Params['vnp_Locale'] = locale;
        vnp_Params['vnp_CurrCode'] = currCode;
        vnp_Params['vnp_TxnRef'] = orderId;
        vnp_Params['vnp_OrderInfo'] = orderInfo;
        vnp_Params['vnp_OrderType'] = orderType;
        vnp_Params['vnp_Amount'] = amount * 100;
        vnp_Params['vnp_ReturnUrl'] = returnUrl;
        vnp_Params['vnp_IpAddr'] = ipAddr;
        vnp_Params['vnp_CreateDate'] = createDate;
        if(bankCode !== null && bankCode !== ''){
            vnp_Params['vnp_BankCode'] = bankCode;
        }
    
        vnp_Params = sortObject(vnp_Params);
    
        var querystring = require('qs');
        var signData = querystring.stringify(vnp_Params, { encode: false });
        var crypto = require("crypto");     
        var hmac = crypto.createHmac("sha512", secretKey);
        var signed = hmac.update(new Buffer(signData, 'utf-8')).digest("hex"); 
        vnp_Params['vnp_SecureHash'] = signed;
        vnpUrl += '?' + querystring.stringify(vnp_Params, { encode: false });
    
        res.redirect(vnpUrl)
    });
    // Vui lòng tham khảo thêm tại code demo
    

private static readonly ILog log =
                LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    
            protected void Page_Load(object sender, EventArgs e)
            {
                string returnContent = string.Empty;
                if (Request.QueryString.Count > 0)
                {
                    string vnp_HashSecret = ConfigurationManager.AppSettings["vnp_HashSecret"]; //Secret key
                    var vnpayData = Request.QueryString;
                    VnPayLibrary vnpay = new VnPayLibrary();
                    foreach (string s in vnpayData)
                    {
                        //get all querystring data
                        if (!string.IsNullOrEmpty(s) && s.StartsWith("vnp_"))
                        {
                            vnpay.AddResponseData(s, vnpayData[s]);
                        }
                    }
                    //Lay danh sach tham so tra ve tu VNPAY
                    //vnp_TxnRef: Ma don hang merchant gui VNPAY tai command=pay    
                    //vnp_TransactionNo: Ma GD tai he thong VNPAY
                    //vnp_ResponseCode:Response code from VNPAY: 00: Thanh cong, Khac 00: Xem tai lieu
                    //vnp_SecureHash: HmacSHA512 cua du lieu tra ve
    
                    long orderId = Convert.ToInt64(vnpay.GetResponseData("vnp_TxnRef"));
                    long vnp_Amount = Convert.ToInt64(vnpay.GetResponseData("vnp_Amount"))/100;
                    long vnpayTranId = Convert.ToInt64(vnpay.GetResponseData("vnp_TransactionNo"));
                    string vnp_ResponseCode = vnpay.GetResponseData("vnp_ResponseCode");
                    string vnp_TransactionStatus = vnpay.GetResponseData("vnp_TransactionStatus");
                    String vnp_SecureHash = Request.QueryString["vnp_SecureHash"];
                    bool checkSignature = vnpay.ValidateSignature(vnp_SecureHash, vnp_HashSecret);
                    if (checkSignature)
                    {
                        //Cap nhat ket qua GD
                        //Yeu cau: Truy van vao CSDL cua  Merchant => lay ra duoc OrderInfo
                        //Giả sử OrderInfo lấy ra được như giả lập bên dưới
                        OrderInfo order = new OrderInfo();//get from DB
                        order.OrderId = orderId;
                        order.Amount = 100000;
                        order.PaymentTranId = vnpayTranId;
                        order.Status = "0"; //0: Cho thanh toan,1: da thanh toan,2: GD loi
                        //Kiem tra tinh trang Order
                        if (order != null)
                        {
                            if (order.Amount == vnp_Amount) {
                                if (order.Status == "0")
                                {
                                    if (vnp_ResponseCode == "00" && vnp_TransactionStatus == "00")
                                    {
                                        //Thanh toan thanh cong
                                        log.InfoFormat("Thanh toan thanh cong, OrderId={0}, VNPAY TranId={1}", orderId,
                                            vnpayTranId);
                                        order.Status = "1";
                                    }
                                    else
                                    {
                                        //Thanh toan khong thanh cong. Ma loi: vnp_ResponseCode
                                        //  displayMsg.InnerText = "Có lỗi xảy ra trong quá trình xử lý. 
                                        Mã lỗi: " + vnp_ResponseCode;
                                        log.InfoFormat("Thanh toan loi, OrderId={0}, VNPAY TranId={1},ResponseCode={2}",
                                            orderId, vnpayTranId, vnp_ResponseCode);
                                        order.Status = "2";
                                    }
    
                                    //Thêm code Thực hiện cập nhật vào Database 
                                    //Update Database
    
                                    returnContent = "{\"RspCode\":\"00\",\"Message\":\"Confirm Success\"}";
                                }
                                else
                                {
                                    returnContent = "{\"RspCode\":\"02\",\"Message\":\"Order already confirmed\"}";
                                }
                            }
                            else
                            {
                                returnContent = "{\"RspCode\":\"04\",\"Message\":\"invalid amount\"}";
                            }
                        }
                        else
                        {
                            returnContent = "{\"RspCode\":\"01\",\"Message\":\"Order not found\"}";
                        }
                    }
                    else
                    {
                        log.InfoFormat("Invalid signature, InputData={0}", Request.RawUrl);
                        returnContent = "{\"RspCode\":\"97\",\"Message\":\"Invalid signature\"}";
                    }
                }
                else
                {
                    returnContent = "{\"RspCode\":\"99\",\"Message\":\"Input data required\"}";
                }
    
    
                Response.ClearContent();
                Response.Write(returnContent);
                Response.End();
            }

    def payment_ipn(request):
        inputData = request.GET
        if inputData:
            vnp = vnpay()
            vnp.responseData = inputData.dict()
            order_id = inputData['vnp_TxnRef']
            amount = inputData['vnp_Amount']
            order_desc = inputData['vnp_OrderInfo']
            vnp_TransactionNo = inputData['vnp_TransactionNo']
            vnp_ResponseCode = inputData['vnp_ResponseCode']
            vnp_TmnCode = inputData['vnp_TmnCode']
            vnp_PayDate = inputData['vnp_PayDate']
            vnp_BankCode = inputData['vnp_BankCode']
            vnp_CardType = inputData['vnp_CardType']
            if vnp.validate_response(settings.VNPAY_HASH_SECRET_KEY):
                # Check & Update Order Status in your Database
                # Your code here
                firstTimeUpdate = True
                totalAmount = True
                if totalAmount:
                    if firstTimeUpdate:
                        if vnp_ResponseCode == '00':
                            print('Payment Success. Your code implement here')
                        else:
                            print('Payment Error. Your code implement here')
    
                        # Return VNPAY: Merchant update success
                        result = JsonResponse({'RspCode': '00', 'Message': 'Confirm Success'})
                    else:
                        # Already Update
                        result = JsonResponse({'RspCode': '02', 'Message': 'Order Already Update'})
                else:
                    # invalid amount
                    result = JsonResponse({'RspCode': '04', 'Message': 'invalid amount'})
            else:
                # Invalid Signature
                result = JsonResponse({'RspCode': '97', 'Message': 'Invalid Signature'})
        else:
            result = JsonResponse({'RspCode': '99', 'Message': 'Invalid request'})
    
        return result
            

 <%
        try
        {
                        
        /*  IPN URL: Record payment results from VNPAY
        Implementation steps:
        Check checksum
        Find transactions (vnp_TxnRef) in the database (checkOrderId)
        Check the payment status of transactions before updating (checkOrderStatus)
        Check the amount (vnp_Amount) of transactions before updating (checkAmount)
        Update results to Database
        Return recorded results to VNPAY
        */
                
            // ex:  	PaymnentStatus = 0; pending 
            //              PaymnentStatus = 1; success 
            //              PaymnentStatus = 2; Faile 
            
            //Begin process return from VNPAY	
            Map fields = new HashMap();
             for (Enumeration params = request.getParameterNames(); params.hasMoreElements();) {
                String fieldName = URLEncoder.encode((String) params.nextElement(), StandardCharsets.US_ASCII.toString());
                String fieldValue = URLEncoder.encode(request.getParameter(fieldName), StandardCharsets.US_ASCII.toString());
                if ((fieldValue != null) && (fieldValue.length() > 0)) {
                    fields.put(fieldName, fieldValue);
                }
            }
    
            String vnp_SecureHash = request.getParameter("vnp_SecureHash");
            if (fields.containsKey("vnp_SecureHashType")) 
            {
                fields.remove("vnp_SecureHashType");
            }
            if (fields.containsKey("vnp_SecureHash")) 
            {
                fields.remove("vnp_SecureHash");
            }
            
            // Check checksum
            String signValue = Config.hashAllFields(fields);
            if (signValue.equals(vnp_SecureHash)) 
            {
    
                boolean checkOrderId = true; // vnp_TxnRef exists in your database
                boolean checkAmount = true; // vnp_Amount is valid (Check vnp_Amount VNPAY returns compared to the 
                amount of the code (vnp_TxnRef) in the Your database).
                boolean checkOrderStatus = true; // PaymnentStatus = 0 (pending)
                
                
                if(checkOrderId)
                {
                    if(checkAmount)
                    {
                        if (checkOrderStatus)
                        {
                            if ("00".equals(request.getParameter("vnp_ResponseCode")))
                            {
                                
                                //Here Code update PaymnentStatus = 1 into your Database
                            }
                            else
                            {
                                
                                // Here Code update PaymnentStatus = 2 into your Database
                            }
                            out.print ("{\"RspCode\":\"00\",\"Message\":\"Confirm Success\"}");
                        }
                        else
                        {
                            
                            out.print("{\"RspCode\":\"02\",\"Message\":\"Order already confirmed\"}");
                        }
                    }
                    else
                    {
                       out.print("{\"RspCode\":\"04\",\"Message\":\"Invalid Amount\"}"); 
                    }
                }
                else
                {
                    out.print("{\"RspCode\":\"01\",\"Message\":\"Order not Found\"}");
                }
            } 
            else 
            {
                out.print("{\"RspCode\":\"97\",\"Message\":\"Invalid Checksum\"}");
            }
        }
        catch(Exception e)
        {
            out.print("{\"RspCode\":\"99\",\"Message\":\"Unknow error\"}");
        }
    %>
    
    

    router.get('/vnpay_ipn', function (req, res, next) {
        var vnp_Params = req.query;
        var secureHash = vnp_Params['vnp_SecureHash'];
    
        delete vnp_Params['vnp_SecureHash'];
        delete vnp_Params['vnp_SecureHashType'];
    
        vnp_Params = sortObject(vnp_Params);
        var config = require('config');
        var secretKey = config.get('vnp_HashSecret');
        var querystring = require('qs');
        var signData = querystring.stringify(vnp_Params, { encode: false });
        var crypto = require("crypto");     
        var hmac = crypto.createHmac("sha512", secretKey);
        var signed = hmac.update(new Buffer(signData, 'utf-8')).digest("hex");     
         
    
        if(secureHash === signed){
            var orderId = vnp_Params['vnp_TxnRef'];
            var rspCode = vnp_Params['vnp_ResponseCode'];
            //Kiem tra du lieu co hop le khong, cap nhat trang thai don hang va gui ket qua cho VNPAY theo dinh dang duoi
            res.status(200).json({RspCode: '00', Message: 'success'})
        }
        else {
            res.status(200).json({RspCode: '97', Message: 'Fail checksum'})
        }
    });
    

 private static readonly 
        ILog log =
               LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    
            protected void Page_Load(object sender, EventArgs e)
            {
                log.InfoFormat("Begin VNPAY Return, URL={0}", Request.RawUrl);
                if (Request.QueryString.Count > 0)
                {
                    string vnp_HashSecret = ConfigurationManager.AppSettings["vnp_HashSecret"]; //Chuoi bi mat
                    var vnpayData = Request.QueryString;
                    VnPayLibrary vnpay = new VnPayLibrary();
                     
                    foreach (string s in vnpayData)
                    {
                        //get all querystring data
                        if (!string.IsNullOrEmpty(s) && s.StartsWith("vnp_"))
                        {
                            vnpay.AddResponseData(s, vnpayData[s]);
                        }
                    }
                    //vnp_TxnRef: Ma don hang merchant gui VNPAY tai command=pay    
                    //vnp_TransactionNo: Ma GD tai he thong VNPAY
                    //vnp_ResponseCode:Response code from VNPAY: 00: Thanh cong, Khac 00: Xem tai lieu
                    //vnp_SecureHash: HmacSHA512 cua du lieu tra ve
    
                    long orderId = Convert.ToInt64(vnpay.GetResponseData("vnp_TxnRef"));
                    long vnpayTranId = Convert.ToInt64(vnpay.GetResponseData("vnp_TransactionNo"));
                    string vnp_ResponseCode = vnpay.GetResponseData("vnp_ResponseCode");
                    string vnp_TransactionStatus = vnpay.GetResponseData("vnp_TransactionStatus");
                    String vnp_SecureHash = Request.QueryString["vnp_SecureHash"];
                    String TerminalID = Request.QueryString["vnp_TmnCode"];
                    long vnp_Amount = Convert.ToInt64(vnpay.GetResponseData("vnp_Amount"))/100;
                    String bankCode = Request.QueryString["vnp_BankCode"];
    
                    bool checkSignature = vnpay.ValidateSignature(vnp_SecureHash, vnp_HashSecret);
                    if (checkSignature)
                    {
                        if (vnp_ResponseCode == "00" && vnp_TransactionStatus == "00")
                        {
                            //Thanh toan thanh cong
                            displayMsg.InnerText = "Giao dịch được thực hiện thành công. Cảm ơn quý khách đã sử 
                            dụng dịch vụ";
                            log.InfoFormat("Thanh toan thanh cong, OrderId={0}, VNPAY TranId={1}", orderId, 
                            vnpayTranId);
                        }
                        else
                        {
                            //Thanh toan khong thanh cong. Ma loi: vnp_ResponseCode
                            displayMsg.InnerText = "Có lỗi xảy ra trong quá trình xử lý.Mã lỗi: " + vnp_ResponseCode;
                            log.InfoFormat("Thanh toan loi, OrderId={0}, VNPAY TranId={1},ResponseCode={2}", orderId, 
                            vnpayTranId, vnp_ResponseCode);
                        }
                        displayTmnCode.InnerText = "Mã Website (Terminal ID):" + TerminalID;
                        displayTxnRef.InnerText = "Mã giao dịch thanh toán:" + orderId.ToString();
                        displayVnpayTranNo.InnerText = "Mã giao dịch tại VNPAY:" + vnpayTranId.ToString();
                        displayAmount.InnerText = "Số tiền thanh toán (VND):" + vnp_Amount.ToString();
                        displayBankCode.InnerText = "Ngân hàng thanh toán:" + bankCode;
                    }
                    else
                    {
                        log.InfoFormat("Invalid signature, InputData={0}", Request.RawUrl);
                        displayMsg.InnerText = "Có lỗi xảy ra trong quá trình xử lý";
                    }
                }
    
            }

 
    def payment_return(request):
        inputData = request.GET
        if inputData:
            vnp = vnpay()
            vnp.responseData = inputData.dict()
            order_id = inputData['vnp_TxnRef']
            amount = int(inputData['vnp_Amount']) / 100
            order_desc = inputData['vnp_OrderInfo']
            vnp_TransactionNo = inputData['vnp_TransactionNo']
            vnp_ResponseCode = inputData['vnp_ResponseCode']
            vnp_TmnCode = inputData['vnp_TmnCode']
            vnp_PayDate = inputData['vnp_PayDate']
            vnp_BankCode = inputData['vnp_BankCode']
            vnp_CardType = inputData['vnp_CardType']
            if vnp.validate_response(settings.VNPAY_HASH_SECRET_KEY):
                if vnp_ResponseCode == "00":
                    return render(request, "payment_return.html", {"title": "Kết quả thanh toán",
                                                                   "result": "Thành công", "order_id": order_id,
                                                                   "amount": amount,
                                                                   "order_desc": order_desc,
                                                                   "vnp_TransactionNo": vnp_TransactionNo,
                                                                   "vnp_ResponseCode": vnp_ResponseCode})
                else:
                    return render(request, "payment_return.html", {"title": "Kết quả thanh toán",
                                                                   "result": "Lỗi", "order_id": order_id,
                                                                   "amount": amount,
                                                                   "order_desc": order_desc,
                                                                   "vnp_TransactionNo": vnp_TransactionNo,
                                                                   "vnp_ResponseCode": vnp_ResponseCode})
            else:
                return render(request, "payment_return.html",
                              {"title": "Kết quả thanh toán", "result": "Lỗi", "order_id": order_id, "amount": amount,
                               "order_desc": order_desc, "vnp_TransactionNo": vnp_TransactionNo,
                               "vnp_ResponseCode": vnp_ResponseCode, "msg": "Sai checksum"})
        else:
            return render(request, "payment_return.html", {"title": "Kết quả thanh toán", "result": ""})
            

<%
    //Begin process return from VNPAY
    Map fields = new HashMap();
    for (Enumeration params = request.getParameterNames(); params.hasMoreElements();) {
    String fieldName = (String) params.nextElement();
    String fieldValue = request.getParameter(fieldName);
    if ((fieldValue != null) && (fieldValue.length() > 0)) {
        fields.put(fieldName, fieldValue);
    }
    }
    
    String vnp_SecureHash = request.getParameter("vnp_SecureHash");
    if (fields.containsKey("vnp_SecureHashType")) {
    fields.remove("vnp_SecureHashType");
    }
    if (fields.containsKey("vnp_SecureHash")) {
    fields.remove("vnp_SecureHash");
    }
    String signValue = Config.hashAllFields(fields);
    
    %>
    <%
    if (signValue.equals(vnp_SecureHash)) {
        if ("00".equals(request.getParameter("vnp_ResponseCode"))) {
            out.print("GD Thanh cong");
        } else {
            out.print("GD Khong thanh cong");
        }
    
    } else {
        out.print("Chu ky khong hop le");
    }
    %>

 
    router.get('/vnpay_return', function (req, res, next) {
        var vnp_Params = req.query;
    
        var secureHash = vnp_Params['vnp_SecureHash'];
    
        delete vnp_Params['vnp_SecureHash'];
        delete vnp_Params['vnp_SecureHashType'];
    
        vnp_Params = sortObject(vnp_Params);
    
        var config = require('config');
        var tmnCode = config.get('vnp_TmnCode');
        var secretKey = config.get('vnp_HashSecret');
    
        var querystring = require('qs');
        var signData = querystring.stringify(vnp_Params, { encode: false });
        var crypto = require("crypto");     
        var hmac = crypto.createHmac("sha512", secretKey);
        var signed = hmac.update(new Buffer(signData, 'utf-8')).digest("hex");     
    
        if(secureHash === signed){
            //Kiem tra xem du lieu trong db co hop le hay khong va thong bao ket qua
    
            res.render('success', {code: vnp_Params['vnp_ResponseCode']})
        } else{
            res.render('success', {code: '97'})
        }
    });