C# ATOM Payment Gateway Implementation

1. Payment Request Page
   
   protected void Page_Load(object sender, EventArgs e)
   {
   try
   {           
       string ATOMPaymentIP = ATOMPaymentIP // PROVIDED BY ATOM //203.114.240.183--Stage
       string ATOMLogin = ATOMLogin // PROVIDED BY ATOM
       string ATOMPassword = ATOMPassword // PROVIDED BY ATOM
       string ATOMTransactionType = ATOMTransactionType // PROVIDED BY ATOM
       string ATOMProductId = ATOMProductId // PROVIDED BY ATOM
   
       HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://" + ATOMPaymentIP + "/paynetz/epi/fts");
   
       request.Method = "POST";
   
       request.ContentType = "application/x-www-form-urlencoded";
       request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; CK={CVxk71YSfgiE6+6P6ftT7lWzblrdvMbRqavYf/6OcMIH8wfE6iK7TNkcwFAsxeChX7qRAlQhvPWso3KI6Jthvnvls9scl+OnAEhsgv+tuvs=}; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
       int pos = Request.Url.AbsoluteUri.LastIndexOf('/');
      
       // PAYMENT RESPONSE PAGE
       string strURL = Request.Url.AbsoluteUri.Substring(0, pos + 1) + "PaymentResponseATOM.aspx";
      
       string postData = "custacc=1234567890&login=" + ATOMLogin + "&pass=" + ATOMPassword + "&ttype=" + ATOMTransactionType + "&prodid=" + ATOMProductId + "&amt=" + PAYMENT AMOUNT + "&txncurr=INR&txnscamt=0&clientcode=" + CLIENT CODE(USER DEFINED) + "=&txnid=" + TRANSACTION ID + "&date=" + DateTime.Now.ToString("dd/mm/yyyy hh:mm:ss") + "&ru=" + strURL + "&udf1=" + FIRST NAME + "&udf2=" + EMAIL OF CUSTOMER + "&udf3=" + CUSTOMER MOBILE + "&udf4=" + CUSTOMER ADDRESS + "&udf5=" + EMI OPTION IF REQUIRED(BANK NAME) + "&udf6=" + EMI OPTION IF REQUIRED;
   
       byte[] byteArray = Encoding.UTF8.GetBytes(postData);
   
       request.ContentType = "application/x-www-form-urlencoded";
   
       request.ContentLength = byteArray.Length;
       request.AllowAutoRedirect = true;
   
       request.Proxy.Credentials = CredentialCache.DefaultCredentials;
   
       Stream dataStream = request.GetRequestStream();
   
       dataStream.Write(byteArray, 0, byteArray.Length);
   
       dataStream.Close();
   
       WebResponse response = request.GetResponse();
   
       XmlDocument objXML = new XmlDocument();
   
       dataStream = response.GetResponseStream();
   
       objXML.Load(dataStream);
   
       string TxnId = objXML.DocumentElement.ChildNodes[0].ChildNodes[0].ChildNodes[2].InnerText;
   
       string Token = objXML.DocumentElement.ChildNodes[0].ChildNodes[0].ChildNodes[3].InnerText;
       string txnData = "ttype=NBFundTransfer&txnStage=1&tempTxnId=" + TxnId + "&token=" + Token;
   
       dataStream.Close();
       response.Close();
       Response.Redirect("http://" + ATOMPaymentIP + "/paynetz/epi/fts?" + txnData);
   }
   catch (Exception ex)
   {
       HANDLE ERROR   
   }
   }
2. Payment Response Page
   
   protected void Page_Load(object sender, EventArgs e)
   {
   try
   {
       if (!IsPostBack)
       {
       NameValueCollection nvc = Request.Form;
       string mmp_Transaction = nvc["mmp_txn"].ToString();
       string PaymentStatus = nvc["f_code"].ToString();
       string MerchantTransactionId = Request.Form["mer_txn"];
   
       string Amount = Request.Form["amt"];
       string Product = Request.Form["prod"];
       string TransactionDate = Request.Form["date"];
       string BankTransactionId = Request.Form["bank_txn"];
       string ClientCode = Request.Form["clientcode"]; // Encrypted User Information
       string BankName = Request.Form["bank_name"];
   
       //User Details
       string Udf1 = Request.Form["udf1"]; //First Name
       string Udf2 = Request.Form["udf2"]; //Email
       string Udf3 = Request.Form["udf3"]; //Mobile
       string Udf4 = Request.Form["udf4"]; //Address
       string Udf5 = Request.Form["udf5"]; //Bank Name
       string Udf6 = Request.Form["udf6"]; //EMI Option
   
       string strResponceIP = HttpContext.Current.Request.UserHostAddress;
       string strRemarks = "txnId:" + MerchantTransactionId + ", txnStatus:" + PaymentStatus + ", amount:" + Amount + ", pgTxnId:" + mmp_Transaction + ", BankTransactionId:" + BankTransactionId + ", Udf1:" + Udf1 + ", Udf2:" + Udf2 + ", Udf3:" + Udf3 + ", Udf4:" + Udf4 + ", Udf5:" + Udf5 + ", Udf6:" + Udf6;
   
      
       string ATOMPaymentIP = ConfigurationManager.AppSettings["ATOMPaymentIP"].ToString();//203.114.240.183--Stage
       //Verify the Response Server
       if (Request.UrlReferrer.Host.Trim() != ATOMPaymentIP)
       {
           // REDIRECT TO ERROR PAGE IF RESPONSE IP IS NOT VERIFIED
       }
   
       // CHECK THE PAYMENT STATUS AND VALIDATE THE TRANSACTION ID
       if (PaymentStatus.ToUpper().Trim() == "OK" && transactionid.Trim()==MerchantTransactionId.Trim())
       {
           //"Transaction proceed successfully."
   
           // UPDATE THE TRANSACTION STATUS IN DB
           //
           // CODE FOR UPDATE STATUS
           //
           //
          
           // REDIRECT TO SUCCESS PAGE OR SHOW THE PAYMENT RESPONSE ON SAME PAGE   
   
       }
       else
       {
           // PAYMENT STATUS IS NOT SUCCESS OR TRANSACTION ID IS NOT VERIFIED
           // REDIRECT TO ERROR PAGE
       }
       }
   }
   catch (Exception ex)
   {
       // HANDLE ERROR
   }
   }

C# ccAvenue Payment Gateway Implementation

1. Payment Request Page ( ASPX )
   
   
   <html xmlns="http://www.w3.org/1999/xhtml">
   <head id="Head1" runat="server">
       <script src="../js/jquery.min.js" type="text/javascript"></script>
       <script>
           jQuery(document).ready(function () {
               jQuery("#btnSubmit").click();
               //Custom.init();
           });
       </script>
   </head>
   <body>
       <form id="form1" runat="server">
       <table style="display: none;">
           <tr>
               <td>
                   OrderId:
               </td>
               <td>
                   <asp:Label ID="lblOrderId" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   Amount:
               </td>
               <td>
                   <asp:Label ID="lblAmount" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   MerchantId:
               </td>
               <td>
                   <asp:Label ID="lblMerchantId" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   RedirectURL:
               </td>
               <td>
                   <asp:Label ID="lblRedirectUrl" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   BillingCustomerName:
               </td>
               <td>
                   <asp:Label ID="lblCustomerName" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   BillingCustomerAddress:
               </td>
               <td>
                   <asp:Label ID="lblCustAddr" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   BillingCustomerCountry:
               </td>
               <td>
                   <asp:Label ID="lblCustCountry" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   BillingCustomerTelephone:
               </td>
               <td>
                   <asp:Label ID="lblCustPhone" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   BillingCustomerEmail:
               </td>
               <td>
                   <asp:Label ID="lblCustEmail" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   BillingCustomerState:
               </td>
               <td>
                   <asp:Label ID="lblCustState" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   BillingCustomerCity:
               </td>
               <td>
                   <asp:Label ID="lblCustCity" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   ZipCode:
               </td>
               <td>
                   <asp:Label ID="lblZipCode" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   CustomerNotes:
               </td>
               <td>
                   <asp:Label ID="lblCustNotes" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   DeliveryCustomerName:
               </td>
               <td>
                   <asp:Label ID="lblDelCustName" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   DeliveryCustomerAddress:
               </td>
               <td>
                   <asp:Label ID="lblDelCustAddr" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   DeliveryCustomerCountry:
               </td>
               <td>
                   <asp:Label ID="lblDelCustCntry" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   DeliveryCustomerTelephone:
               </td>
               <td>
                   <asp:Label ID="lblDelCustTel" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   DeliveryCustomerState:
               </td>
               <td>
                   <asp:Label ID="lblDelCustState" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   DeliveryCustomerCity:
               </td>
               <td>
                   <asp:Label ID="lblDelCustCity" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   DeliveryCustomerZipCode:
               </td>
               <td>
                   <asp:Label ID="lblDelZipCode" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
                   MerchantParam:
               </td>
               <td>
                   <asp:Label ID="lblMerchantParam" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td>
               </td>
               <td>
                   <asp:Label ID="lblPayType" runat="server"></asp:Label>
               </td>
           </tr>
           <tr>
               <td colspan="2">
                   <asp:Button ID="btnSubmit" runat="server" Text="Submit" PostBackUrl="http://www.ccavenue.com/shopzone/cc_details.jsp" />
               </td>
           </tr>
           <tr>
               <td>
                   <asp:HiddenField ID="Merchant_Id" runat="server" />
                   <asp:HiddenField ID="encRequest" runat="server" />
               </td>
           </tr>
       </table>
       <center>
           <asp:Label ID="lb_Message" Style="color: Red; display: block; margin-top: 35px;"
               runat="server" Text=""></asp:Label>
       </center>
       </form>
   </body>
   </html>
2. Payment Request Page ( ASPX.CS )
   
   CCACrypto chkSum = new CCACrypto();
   string MerchantId = ccAvenueMerchantId // PROVIDED By ccAvenue
   string WorkingKey = ccWorkingKey // Provided By ccAvenue
      
   protected void Page_Load(object sender, EventArgs e)
   {           
       if (IsPostBack == false)
       {
       //PAYMENT RESPONSE PAGE
       string ResponseUrl = HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Authority) +
                   HttpContext.Current.Request.ApplicationPath + "Payment/PaymentResponse.aspx";
       //Get Payment Details from Session
   
           lblOrderId.Text = TRANSACTION ID
           lblAmount.Text = PAYMENT AMOUNT
           lblMerchantId.Text = MerchantId;
           lblRedirectUrl.Text = ResponseUrl;
           lblCustomerName.Text = CUSTOMER NAME
           lblCustAddr.Text = CUSTOMER ADDRESS
           lblCustCountry.Text = CUSTOMER COUNTRY
           lblCustPhone.Text = CUSTOMER PHONE
           lblCustEmail.Text = CUSTOMER EMAIL
           lblCustState.Text = CUSTOMER STATE
           lblCustCity.Text = CUSTOMER CITY
           lblZipCode.Text = CUSTOMER ZIP
           lblCustNotes.Text = CUSTOMER NOTES
           lblDelCustName.Text = CUSTOMER DELIVERY NAME
           lblDelCustAddr.Text = CUSTOMER DELIVERY ADDRESS
           lblDelCustCntry.Text = CUSTOMER DELIVERY COUNTRY
           lblDelCustTel.Text = CUSTOMER DELIVERY PHONE
           lblDelCustState.Text = CUSTOMER DELIVERY STATE
           lblDelCustCity.Text = CUSTOMER DELIVERY CITY
           lblDelZipCode.Text = CUSTOMER DELIVERY ZIP
           lblMerchantParam.Text = MERCHANT EXTRA PARAMETERS
           lblPayType.Text = PAYMENT TYPE(Credit Card/ Debit Card/ Net Banking)
   
           string Res = chkSum.getchecksum(MerchantId, lblOrderId.Text, objPaymentDetails.PaymentAmount.ToString(),
                           ResponseUrl, WorkingKey);
           string billingPageHeading = "";
           string ToEncrypt = "Order_Id=" + lblOrderId.Text + "&Amount=" + objPaymentDetails.PaymentAmount + "&Merchant_Id=" + MerchantId + "&Redirect_Url=" + ResponseUrl +
           "&Checksum=" + Res + "&billing_cust_name=" + objPaymentDetails.Cust_Name + "&billing_cust_address=" + objPaymentDetails.Cust_Add + "&billing_cust_country=" + lblCustCountry.Text +
           "&billing_cust_tel=" + objPaymentDetails.Cust_Mobile + "&billing_cust_email=" + objPaymentDetails.Cust_Email + "&billing_cust_state=" + lblCustState.Text +
           "&billing_cust_city=" + lblCustCity.Text + "&billing_zip_code=" + lblZipCode.Text + "&billing_cust_notes=" + lblCustNotes.Text +
           "&delivery_cust_name=" + objPaymentDetails.Cust_Name + "&delivery_cust_address=" + objPaymentDetails.Cust_Add + "&delivery_cust_country=" + lblDelCustCntry.Text +
           "&delivery_cust_tel=" + objPaymentDetails.Cust_Mobile + "&delivery_cust_state=" + lblDelCustState.Text + "&delivery_cust_city=" + lblDelCustCity.Text +
           "&delivery_zip_code=" + lblDelZipCode.Text + "&Merchant_Param=" + lblMerchantParam.Text + "&billingPageHeading=" + billingPageHeading + "&payType=" + lblPayType.Text;
   
           string Encrypted;
           Encrypted = chkSum.Encrypt(ToEncrypt, WorkingKey);
   
           Merchant_Id.Value = MerchantId;
           encRequest.Value = Encrypted;
   
           lb_Message.Text = "Wait... Redirecting to Payment Gateway.";
   
       }
       else
       {
           lb_Message.Text = "Error on Payment Gateway. Kindly try again.";
       }
       }
   }
3. Payment Response Page
   
   protected void Page_Load(object sender, EventArgs e)
   {
       if (IsPostBack == false)
       {
       string WorkingKey = ccWorkingKey // PROVIDED BY ccAvenue
       CCACrypto func = new CCACrypto();
       string encResponse = Request.Form.ToString();
   
       NameValueCollection Params = new NameValueCollection();
       string[] segments = encResponse.Split('&');
       foreach (string seg in segments)
       {
           string[] parts = seg.Split('=');
           if (parts.Length > 0)
           {
           string Key = parts[0].Trim();
           string Value = parts[1].Trim();
   
           Params.Add(Key, Value);
           }
       }
       try
       {                    
           //Verify with ccAvenue
           string strVerify = func.verifychecksum(Params["Merchant_Id"].ToString(), Params["Order_Id"].ToString(), Params["Amount"].ToString(), Params["AuthDesc"].ToString(), WorkingKey, Params["Checksum"].ToString());
   
           if (strVerify.ToUpper() == "TRUE")
           {
           if (objPaymentDetails != null)
           {
               // UPDATE THE PAYMENT STATUS IN DB
   
               //Update the Payment Status in DB
               //if (Params["AuthDesc"].ToString().Trim() == "Y")
               //    SUCCESS
               //else
               //    FAIL
          
              // REDIRECT TO SUCCESS PAGE OR SHOW THE PAYMENT RESPONSE ON SAME PAGE
   
           }
           else
           {
               // PAYMENT IS FAIL
               // REDIRECT TO ERROR PAGE
           }
           }
           else
           {
           // PAYMENT VERIFICATION IS FAILED
           // REDIRECT TO ERROR PAGE
           }           
       }
       catch (Exception ex)
       {
           // ERROR IN PROCESSING
           // REDIRECT TO ERROR PAGE
       }
       }
   }

C# Tech Process Payment Gateway Implementation

1. Payment Request Page
   
   #region Tech Process Code
   COM.TPSLUtil1 objTPSLUtil1 = new COM.TPSLUtil1();
   COM.CheckSumRequestBean objCheckSumRequestBean = new COM.CheckSumRequestBean();
   
   objCheckSumRequestBean.MerchantTranId = YOUR TRANSACTION ID;
   objCheckSumRequestBean.MarketCode = CURRENCY CODE;
   objCheckSumRequestBean.AccountNo = BANK ACCOUNT CODE
   objCheckSumRequestBean.Amt = PAYMENT AMOUNT
   objCheckSumRequestBean.BankCode = "240";
   objCheckSumRequestBean.PropertyPath = "C:\\MerchantDetails.property";
   
   string strMsg = objTPSLUtil1.transactionRequestMessage(objCheckSumRequestBean);
   
   if (!strMsg.Equals(""))
   {
       Response.Redirect("https://www.tpsl-india.in/PaymentGateway/TransactionRequest.jsp?msg=" + strMsg);
   }
   #endregion
2. Payment Response Page
   
   protected void Page_Load(object sender, EventArgs e)
   {
       try
       {
           if (!Page.IsPostBack)
           {
   
           COM.CheckSumResponseBean objCheckSumResponseBean = new COM.CheckSumResponseBean();
           TPSLUtil1 objTPSLUtil1 = new TPSLUtil1();
           String strResponseMsg = Request["msg"] == null ? "" : Request["msg"].Trim();
             
           string strResponceIP = HttpContext.Current.Request.UserHostAddress;
           string strLogDesc = string.Empty;
   
           String[] token = strResponseMsg.Split('|');
           string txtchecksum, txtauthstatus, txterrordesc, txtsettlementtype, txtaddtninfo1, txtaddtninfo2, txtaddtninfo3, txterrorstatus;
          
           if (token.Length == 26)
           {
               txtchecksum = token[25].ToString();
               txtauthstatus = token[14].ToString();
               txterrordesc = token[24].ToString();
               txtauthstatus = token[14].ToString();
               txtsettlementtype = token[15].ToString();
               txtaddtninfo1 = token[16].ToString();
               txtaddtninfo2 = token[17].ToString();
               txtaddtninfo3 = token[18].ToString();
               txterrorstatus = token[23].ToString();
   
               if (txtauthstatus == "0399")
               {
               // ERROR IN PAYMENT
               // REDIRECT TO ERROR PAGE   
               return;
               }
           }
           else
           {
               // NOT VALID RESPONSE
               // REDIRECT TO ERROR PAGE
               return;
           }
   
           string strRemarks = "Merchant Id:" + token[0].ToString() + ", Subscriber Id:" + token[1].ToString() + ", Ref No:" + token[2].ToString() + ", Bank Ref No:" + token[3].ToString() + ", Amount:" + token[4].ToString() + ", Bank Id:" + token[5].ToString() + ", Bank Merchant Id:" + token[6].ToString() + ", cntype:" + token[7].ToString() + ", Currency:" + token[8].ToString() + ", temCode:" + token[9].ToString() + ", Security Type:" + token[10].ToString() + ", Security ID:" + token[11].ToString() + ", Security Pass:" + token[12].ToString() + ", Date:" + token[13].ToString() + ", Status:" + token[14].ToString() + ", Settellement Type:" + token[15].ToString() + ", Add Info1:" + token[16].ToString() + ", Add Info2:" + token[17].ToString() + ", Add Info3:" + token[18].ToString() + ", Add Info4:" + token[19].ToString() + ", Add Info5:" + token[20].ToString() + ", Add Info6:" + token[21].ToString() + ", Add Info7:" + token[22].ToString() + ", Error Status:" + token[23].ToString() + ", Error Desc:" + token[24].ToString() + ", Check Sum:" + token[25].ToString();
   
           objCheckSumResponseBean.MSG = strResponseMsg;
           objCheckSumResponseBean.PropertyPath = "C:\\TechProcess-Interface\\NLMerchantDetails.property";
          
           string strCheckSumValue = string.Empty;
          
           strCheckSumValue = objTPSLUtil1.transactionResponseMessage(objCheckSumResponseBean);
   
           if (!strCheckSumValue.Equals(""))
           {
               if (!txtchecksum.Equals(strCheckSumValue))
               {
               txtauthstatus = "0399";
               // Transaction Failed due to checksum mismatch
               // REDIRECT TO ERROR PAGE
   
               }
               else
               {
               //0300 // SUCCESS CODE
               try
               {
                   // UPDATE THE TRANSACTION STATUS IN DB
                   //
                   // CODE FOR UPDATE STATUS
                   //
                   //
          
                   // REDIRECT TO OTHER PAGE OR SHOW THE PAYMENT RESPONSE ON SAME PAGE
               }
               catch (Exception ex)
               {
                   // INVALID RESPONSE CODE
                   // REDIRECT TO ERROR PAGE
               }
               }
           }
           else
           {
               // INVALID RESPONSE CODE
               // REDIRECT TO ERROR PAGE
           }
   
           }
       }
       catch (Exception ex)
       {
           // ERROR OCCURED
           // REDIRECT TO ERROR PAGE
       }
   
   }
   

C# CITRUS Payment Gateway Implementation

1. Payment Request Page (ASPX)
   
   <html xmlns="http://www.w3.org/1999/xhtml">
   <head id="Head1" runat="server">
   
       <script src="../../RESOURCES/js/accordion/jquery.min.js" type="text/javascript"></script>
       <title>Redirecting...</title>
        <script type="text/javascript">
   
            $(document).ready(function () {
                $('#FName').val($('#hdnFname').val());
                $('#LName').val($('#hdnLname').val());
                $('#Email').val($('#hdnEmail').val());
                $('#Address').val($('#hdnAddress').val());
                $('#City').val($('#hdnCity').val());
                $('#AddressZip').val($('#hdnZip').val());
                $('#State').val($('#hdnState').val());
                $('#Mobile').val($('#hdnMobile').val());
                $('#returnUrl').val($('#hdnReturnUrl').val());
                //alert($('#FName').val());
                merchantURLPart = $('#hdnPaymentURL').val();
                $('#btnSubmit').click();
            });
   
            var merchantURLPart = '';
        //"https://sandbox.citruspay.com/CLIENTID"; -- CLIENTID WILL BE PROVIDED BY CITRUS
           
        var vanityURLPart = "";
            var reqObj = null;
            function generateHMAC() {
                if (window.XMLHttpRequest) {
                    reqObj = new XMLHttpRequest();
                } else {
                    reqObj = new ActiveXObject("Microsoft.XMLHTTP");
                }
                if (merchantURLPart.lastIndexOf("/") != -1) {
                    vanityURLPart = merchantURLPart.substring(merchantURLPart.lastIndexOf("/") + 1)
                }
                var orderAmount = document.getElementById("orderAmount").value;
                var merchantTxnId = document.getElementById("merchantTxnId").value;
                var currency = document.getElementById("currency").value;
                var param = "merchantId=" + vanityURLPart + "&orderAmount=" + orderAmount
                   + "&merchantTxnId=" + merchantTxnId + "&currency=" + currency;
                reqObj.onreadystatechange = process;
                reqObj.open("POST", "hmac_signature.aspx?" + param, false);
                reqObj.send(null);
            }
            function process() {
                if (reqObj.readyState == 4) {
                    document.getElementById("secSignature").value = reqObj.responseText;
                    submitForm();
                }
            }
   
            function submitForm() {
                document.paymentForm.action = merchantURLPart;
                document.paymentForm.method = 'POST';
                document.paymentForm.submit();
            }
          
       </script>
   </head>
   <body>
   <form name="paymentForm" runat="server" id="paymentForm">
   <div>
   <div>
   <div style="text-align:center;">
   <br />
   <center>
   <b>Please wait... Redirecting...</b>
   </center>                   
   </div>
   
   <ul style="display:none;">
       <li class="clearfix">
       <label width="125px;">
           Transaction Number:</label>
       <input type="text" id="merchantTxnId" runat="server" name="merchantTxnId" value="" />
       </li>
       <li class="clearfix">
       <label width="125px;">
           Order Amount:</label>
       <input type="text" id="orderAmount"  runat="server" name="orderAmount" value="" />
       </li>
       <li class="clearfix">
       <label width="125px;">
           Currency:</label>
       <input type="text" id="currency"  name="currency" value="INR" />
       </li>
       <li class="clearfix">
       <label width="125px;">
           First Name :</label>
       <input type="text" id="FName" name="firstName" value="" />
       </li>
       <li class="clearfix">
       <label width="125px;">
           Last Name :</label>
       <input type="text" id="LName" name="lastName" value="" />
       </li>
       <li class="clearfix">
       <label width="125px;">
           Email :</label>
       <input type="text" id="Email" name="email" value="" />
       </li>
       <p>
       Address Details</p>
       <li class="clearfix">
       <label width="125px;">
           Address :</label>
       <input type="text" id="Address" name="addressStreet1" value="" />
       </p>                               
       <li class="clearfix">
           <label width="125px;">
           City :</label>
           <input type="text" id="City" name="addressCity" value="" />
       </li>
       <li class="clearfix">
           <label width="125px;">
           Zip Code :</label>
           <input type="text" id="AddressZip" name="addressZip" value="" />
       </li>
       <li class="clearfix">
           <label width="125px;">
           State :</label>
           <input type="text" id="State"  name="addressState" value="" />
       </li>
                      
       <!-- <input type="hidden" class="text" name="addressCountry" value="INDIA" /> -->
                      
       <li class="clearfix">
           <label width="125px;">
           Mobile No:</label>
           <input type="text" id="Mobile"  name="phoneNumber" value="" />
       </li>
      
       <input type="hidden" name="paymentMode" value="NET_BANKING" />
       <input type="hidden" name="issuerCode" value="ISS008" />                               
         
       <%--<input type="hidden" id="ReturnUrl" name="returnUrl" runat="server" value="http://localhost:1463/sample-site/TestMotoResponse.aspx" />--%>
      
       <input type="text" id="returnUrl" name="returnUrl" value="" />
      
       <input type="hidden" id="secSignature" name="secSignature" value="" />
       <input type="hidden" name="reqtime" id="reqtime" value="<%=System.DateTime.Now.Ticks / 10000 %>" />
       <input id="btnSubmit" type="button" value="Make Payment" onclick="JavaScript:generateHMAC();"></input>
      
      
       <input type="hidden" id="hdnFname" runat="server"/>                               
       <input type="hidden" id="hdnLname" runat="server"/>                               
       <input type="hidden" id="hdnEmail" runat="server"/>                               
       <input type="hidden" id="hdnAddress" runat="server"/>                               
       <input type="hidden" id="hdnCity" runat="server"/>                               
       <input type="hidden" id="hdnZip" runat="server"/>                               
       <input type="hidden" id="hdnState" runat="server"/>                               
       <input type="hidden" id="hdnMobile" runat="server"/>    
       <input type="hidden" id="hdnReturnUrl" runat="server"/>                     
       <input type="hidden" id="hdnPaymentURL" value="123" runat="server"/>                     
      
       </ul>
       </div>
   </div>   
   </form>
   </body>
   </html>
2. Payment Resquest Page (ASPX.CS)
   
   protected void Page_Load(object sender, EventArgs e)
   {
       try
       {  
           int pos = Request.Url.AbsoluteUri.LastIndexOf('/');
           string strURL = Request.Url.AbsoluteUri.Substring(0, pos + 1) + "PaymentResponseCITRUS.aspx";
   
           merchantTxnId.Value = YOUR TRANSACTION ID;
           orderAmount.Value = PAYMENT AMOUNT;
           hdnFname.Value = FIRST NAME OF CLIENT;
           hdnLname.Value = LAST NAME OF CLIENT;
           hdnEmail.Value = EMAIL OF CLIENT;
           hdnAddress.Value = ADDRESS OF CLIENT;
           hdnCity.Value = CITY OF CLIENT;
           hdnZip.Value = ZIPCODE OF CLIENT;
           hdnState.Value = STATE OF CLIENT;
           hdnMobile.Value = MOBILE OF CLIENT;
           hdnReturnUrl.Value = strURL; // RESPONSE URL
   
           //Payment URL
           hdnPaymentURL.Value = https://sandbox.citruspay.com/CLIENTID;
          
       }
       catch (Exception ex)
       {
          // LOG THE ERROR    
       }
   }
3. hmac_signature.aspx
   
   <%@ Page Language="C#" AutoEventWireup="true" %>
   
   <%
   string key = CITRUS SECRET KEY (PROVIDED BY CITRUS)
   string merchantId = Request["merchantId"];
   string orderAmount = Request["orderAmount"];
   string merchantTxnId = Request["merchantTxnId"];
   string currency = Request["currency"];
   
   string data = merchantId + orderAmount + merchantTxnId + currency;
   try {
   %>
   <%= CitrusPay.MerchantKit.Infrastructure.CitrusPaySignatureRequestor.GenerateHMAC(data, key)%>
   <%
   }catch(Exception e){
          
   }
   %>
4. Payment Response Page
   
   protected void Page_Load(object sender, EventArgs e)
   {
       try
       {
           String key = CITRUS SECRET KEY (PROVIDED BY CITRUS)
           String data = "";
           String txnId = Request["TxId"];
           String txnStatus = Request["TxStatus"];
           String amount = Request["amount"];
           String pgTxnId = Request["pgTxnNo"];
           String issuerRefNo = Request["issuerRefNo"];
           String authIdCode = Request["authIdCode"];
           String firstName = Request["firstName"];
           String lastName = Request["lastName"];
           String pgRespCode = Request["pgRespCode"];
           String zipCode = Request["addressZip"];
           String reqSignature = Request["signature"];
   
           String signature = "";
           bool flag = true;
           if (txnId != null)
           {
           data += txnId;
           }
           if (txnStatus != null)
           {
           data += txnStatus;
           }
           if (amount != null)
           {
           data += amount;
           }
           if (pgTxnId != null)
           {
           data += pgTxnId;
           }
           if (issuerRefNo != null)
           {
           data += issuerRefNo;
           }
           if (authIdCode != null)
           {
           data += authIdCode;
           }
           if (firstName != null)
           {
           data += firstName;
           }
           if (lastName != null)
           {
           data += lastName;
           }
           if (pgRespCode != null)
           {
           data += pgRespCode;
           }
           if (zipCode != null)
           {
           data += zipCode;
           }
           signature = CitrusPay.MerchantKit.Infrastructure.CitrusPaySignatureRequestor.GenerateHMAC(data, key);   
   
           if (reqSignature != null && !signature.Equals(reqSignature))
           {
           flag = false;
           }
           if (flag)
           {
           try
           {
               //Check the Status
               if (txnStatus.Trim().ToUpper() == "SUCCESS")
               {
               // UPDATE THE TRANSACTION STATUS IN DB
               //
               // CODE FOR UPDATE STATUS
               //
   
               // REDIRECT TO SUCCESS PAGE OR SHOW THE PAYMENT RESPONSE ON SAME PAGE
               }
               else
               {
               // PAYMENT IS NOT SUCCESSFUL
               // REDIRECT TO ERROR PAGE
               }
           }
           catch (Exception ex)
           {
               // ERROR OCCURED WHILE PAYMENT
               // REDIRECT TO ERROR PAGE
           }
           }
           else
           {
           // SIGNATURE VALIDATION IS WRONG
           // REDIRECT TO ERROR PAGE    
           }
   
       }
       catch (Exception ex)
       {
           // ERROR OCCURED WHILE PAYMENT
           // REDIRECT TO ERROR PAGE   
       }
   }

C# HDFC Payment Gateway ( UMI Method ) Implementation

1. Payment Request Page
   
   protected void Page_Load(object sender, EventArgs e)
   {
   
   #region UMI Method Implementation
   
   string TranTrackid = string.Empty;
   string TranAmount = string.Empty;
   
   TranTrackid = YOUR TRANSACTION ID;
   TranAmount = PAYMENT AMOUNT;
   
   string ReqTranportalId = string.Empty;
   string ReqTranportalPassword = string.Empty;
   ReqTranportalId = "id=" + TRANSPORTAL ID PROVIDED BY BANK + "&";
   ReqTranportalPassword = "password=" + TRANSPORTAL PASSWORD PROVIDED BY BANK + "&";
   
   string ReqAction = "action=" + "1" + "&";
   string ReqLangid = "langid=" + "USA" + "&";
   string ReqCurrency = "currencycode=" + "356" + "&";
   //356 FOR INR
   string ReqAmount = "amt=" + TranAmount + "&";
   
   int pos = Request.Url.AbsoluteUri.LastIndexOf('/');
   string strURL = Request.Url.AbsoluteUri.Substring(0, pos + 1) + "PaymentResponseHDFC.aspx";
   //RESPONSE PAGE URL
   string strErrorURL = Request.Url.AbsoluteUri.Substring(0, pos + 1) + "PaymentError.aspx";
   //ERROR PAGE URL
   string ReqResponseUrl = "responseURL=" + strURL + "&";
   string ReqErrorUrl = "errorURL=" + strErrorURL + "&";
   
   string ReqTrackId = "trackid=" + TranTrackid + "&";
   
   string HDFCPayURL = string.Empty;
   HDFCPayURL = SECUREPG; //SECUREPGTEST for UAT and SECUREPG for PRODUCTION
   
   string ReqUdf1 = string.Empty;
   string ReqUdf2 = string.Empty;
   string ReqUdf3 = string.Empty;
   string ReqUdf4 = string.Empty;
   string ReqUdf5 = string.Empty;
   
   ReqUdf1 = "udf1=" + FirstName + "&";            // UDF1 values                                                               
   ReqUdf2 = "udf2=" + PersonalEmailID + "&";        // UDF2 values                                                                   
   ReqUdf3 = "udf3=" + MobileNumber + "&";             // UDF3 values
   ReqUdf4 = "udf4=" + City +"&";                 // UDF4 values       
   ReqUdf5 = "udf5=" + UserIdentifier + "&";        // UDF5 values 
   
   try
   {
       string TranResponse = "";//Declaration of variable
       string TranRequest = ReqTranportalId + ReqTranportalPassword + ReqAction + ReqLangid + ReqCurrency + ReqAmount + ReqResponseUrl + ReqErrorUrl + ReqTrackId + ReqUdf1 + ReqUdf2 + ReqUdf3 + ReqUdf4 + ReqUdf5;
       string TranUrl = "https://" + HDFCPayURL + ".fssnet.co.in/pgway/servlet/PaymentInitHTTPServlet";
       System.IO.StreamWriter myWriter = null;
   
       // it will open a http connection with provided url
       System.Net.HttpWebRequest objRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(TranUrl);//send data using objxmlhttp object
       objRequest.Method = "POST";
       objRequest.ContentLength = TranRequest.Length;
       objRequest.ContentType = "application/x-www-form-urlencoded";//to set content type
       myWriter = new System.IO.StreamWriter(objRequest.GetRequestStream());
       myWriter.Write(TranRequest);//send data
       myWriter.Close();//closed the myWriter object
   
       System.Net.HttpWebResponse objResponse = (System.Net.HttpWebResponse)objRequest.GetResponse();
       //receive the responce from objxmlhttp object
       using (System.IO.StreamReader sr = new System.IO.StreamReader(objResponse.GetResponseStream()))
       {
       TranResponse = sr.ReadToEnd();
   
       string[] ErrorCheck = GetStringInBetween(TranResponse, "!", "!-", false, false);//This line will find Error Keyword in TranResponse   
   
       if (ErrorCheck[0] != "ERROR")//This block will check for Error in TranResponce
       {
           // Merchant MUST map (update) the Payment ID received with the merchant Track Id in his database at this place.
           string payid = TranResponse.Substring(0, TranResponse.IndexOf(":http"));
           string payURL = TranResponse.Substring(TranResponse.IndexOf("http"));
           // here redirecting the customer browser from ME site to Payment Gateway Page with the Payment ID
   
           //UPDATE THE payid(PAYMENT ID) IN DB
           //
           //CODE FOR UPDATE PAYMENT ID
           //
   
           //REDIRECT ON payURL(PAYMENT GATEWAY URL)
           string TranRedirect = payURL + "?PaymentID=" + payid;
           Response.Redirect(TranRedirect);
       }
       else
       {
           string TranErrorUrl = strErrorURL + "?Message=Transaction Failed&ResTrackId=" + TranTrackid + "&ResAmount=" + TranAmount + "&ResError=" + TranResponse;
      
           //REDIRECT TO ERROR PAGE   
           Response.Redirect(TranErrorUrl);
       }
   
       }
   }
   catch (Exception ex)// any excpetion occurred for above code exception throws here
   {
       //REDIRECT ON ERROR PAGE IN CASE OF ERROR
   }
   
   }
   
   #endregion
   
   }
   
   public static string[] GetStringInBetween(string strSource, string strBegin, string strEnd, bool includeBegin, bool includeEnd)
       {
           string[] result = { "", "" };
           int iIndexOfBegin = strSource.IndexOf(strBegin);
           if (iIndexOfBegin != -1)
           {
               // include the Begin string if desired
   
               if (includeBegin)
               {
                   iIndexOfBegin -= strBegin.Length;
               }
               strSource = strSource.Substring(iIndexOfBegin + strBegin.Length);
               int iEnd = strSource.IndexOf(strEnd);
               if (iEnd != -1)
               {  // include the End string if desired
                   if (includeEnd)
                   { iEnd += strEnd.Length; }
                   result[0] = strSource.Substring(0, iEnd);
                   // advance beyond this segment
                   if (iEnd + strEnd.Length < strSource.Length)
                   { result[1] = strSource.Substring(iEnd + strEnd.Length); }
               }
           }
           else
           // stay where we are
           { result[1] = strSource; }
           return result;
       }//String function end
   
2. Payment Response Page
   
   
   protected void Page_Load(object sender, EventArgs e)
   {
   
       #region UMI Method Implementation
   
       string strResponceIP, TranInqResponse, ResPaymentId, ResResult, ResErrorText, ResPosdate, ResTranId, ResAuth, ResAVR, ResAmount, ResErrorNo, ResTrackID, ResRef, Resudf1, Resudf2, Resudf3, Resudf4, Resudf5, EMI;
   
       strResponceIP = HttpContext.Current.Request.UserHostAddress;
       int pos = Request.Url.AbsoluteUri.LastIndexOf('/');
   
       VALIDATE THE IP ADDRESS
   
   
       if ( ( (HOSTED ON PRODUCTION) && strResponceIP != "221.134.101.187" && strResponceIP != "221.134.101.175" && strResponceIP != "221.134.101.166" && strResponceIP.Trim() != "10.1.40.2")
           || ( (HOSTED ON UAT) && strResponceIP != "221.134.101.174" && strResponceIP != "221.134.101.169" && strResponceIP.Trim() != "10.1.40.2"))
       {
           //REDIRECT TO ERROR PAGE IF IP DOES NOT MATCH
       }
       else
       {
           // IP MATCHED
          
           ResErrorText = Request["ErrorText"];        //Error Text/message
           ResPaymentId = Request["paymentid"];        //Payment Id
           ResTrackID = Request["trackid"];            //Merchant Track ID
           ResErrorNo = Request["Error"];            //Error Number
   
           //To collect transaction result
           ResResult = Request["result"];            //Transaction Result
           ResPosdate = Request["postdate"];            //Postdate
           //To collect Payment Gateway Transaction ID, this value will be used in dual verification request
           ResTranId = Request["tranid"];            //Transaction ID
           ResAuth = Request["auth"];                //Auth Code       
           ResAVR = Request["avr"];                //TRANSACTION avr                   
           ResRef = Request["ref"];                //Reference Number also called Seq Number
           //To collect amount from response
           ResAmount = Request["amt"];                //Transaction Amount
   
           Resudf1 = Request["udf1"];                //UDF1
           Resudf2 = Request["udf2"];                //UDF2
           Resudf3 = Request["udf3"];                //UDF3
           Resudf4 = Request["udf4"];                //UDF4
           Resudf5 = Request["udf5"];                //UDF5
   
           try
           {
           // LOG THE RESPONSE FIRST
           string strRemarks = "Paymentid: " + ResPaymentId + " Result: " + ResResult + " ResErrorText:" + ResErrorText + " ResErrorNo:" + ResErrorNo + " ResAVR:" + ResAVR + " ResAmount:" + ResAmount + " ResRef:" + ResRef + " Postdate: " + ResPosdate + " PGTransactionID: " + ResTranId + " TransactionID: " + ResTrackID + " auth: " + ResAuth + " Resudf1: " + Resudf1 + " Resudf1: " + Resudf2 + " Resudf3: " + Resudf3 + " Resudf4: " + Resudf4 + " Resudf5: " + Resudf5;
           GlbFunctions.LogEvent(Page, "3.Response Page Param values: " + strRemarks + " Response Time: " + DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss"), "S");
           }
           catch (Exception ex)
           {
           GlbFunctions.LogError("Payment Verify - Logging result", "Message: " + ex.Message + " StackTrace: " + ex.StackTrace, "WEBAPPLN_UI_TRANSACTIONS_PaymentResponseHDFC", "Page_Load", "UI", "-1");
           }
   
           if (ResErrorNo == null)
           {   
           //check result is captured or approved i.e. successful
           if (ResResult == "CAPTURED" || ResResult == "APPROVED")//If resulr is CAPTURED or APPROVED then below Code is execute for dual inquiry
           {
               //Validate parameters   
               if (ResPaymentId == null || ResTrackID == null || ResTranId == null || ResAuth == null || ResRef == null || ResAmount == null)
               {
               // REDIRECT TO ERROR PAGE IF REQUIRED PARAMETERS ARE NULL
               Response.Clear();
               Response.Write("REDIRECT=" + Request.Url.AbsoluteUri.Substring(0, pos + 1) + "PaymentError.aspx?Message=PARMETER VALIDATION FAILED");
               Response.End();
               }
               else
               {
               string ReqTranportalId = string.Empty;
               string ReqTranportalPassword = string.Empty;
              
               //DUAL VERIFIACTION URL, this is test environment URL, contact bank for production DUAL Verification URL
               string INQUrl = "https://" + PAYMENT GATE WAY URL(SECUREPG / SECUREPGTEST) + ".fssnet.co.in/pgway/servlet/TranPortalXMLServlet";
               ReqTranportalId = "<id>" + TRANSPORTAL ID PROVIDED BY BANK + "</id>";
               ReqTranportalPassword = "<password>" + TRANSPORTAL PASSWORD PROVIDED BY BANK + "</password>";
              
               // Pass DUAL VERIFICATION action code, always pass "8" for DUAL VERIFICATION
               string INQAction = "<action>8</action>";
               //Pass PG Transaction ID for Dual Verification
               string INQTransId = "<transid>" + ResTranId + "</transid>";
               //create string for request of input parameters
               string INQRequest = ReqTranportalId + ReqTranportalPassword + INQAction + INQTransId;
   
               try
               {
                   //create a SSL connection xmlhttp formated object server-to-server
                   System.IO.StreamWriter myWriter = null;
                   // it will open a http connection with provided url
                   System.Net.HttpWebRequest objRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(INQUrl);//send data using objxmlhttp object
   
                   objRequest.Method = "POST";
                   objRequest.ContentLength = INQRequest.Length;
                   objRequest.ContentType = "application/x-www-form-urlencoded";//to set content type
                   myWriter = new System.IO.StreamWriter(objRequest.GetRequestStream());
   
                   myWriter.Write(INQRequest);//send data
                   myWriter.Close();//closed the myWriter object
   
                   System.Net.HttpWebResponse objResponse = (System.Net.HttpWebResponse)objRequest.GetResponse();
   
                   //receive the responce from objxmlhttp object
                   using (System.IO.StreamReader sr = new System.IO.StreamReader(objResponse.GetResponseStream()))
                   {
                   TranInqResponse = sr.ReadToEnd();
                   string[] INQCheck = GetStringInBetween(TranInqResponse, "<result>", "</result>", false, false);//This line will check if any error in TranInqResponse        
   
                   if (INQCheck[0] == "CAPTURED" || INQCheck[0] == "APPROVED" || INQCheck[0] == "SUCCESS")
                   {
                       string[] INQResResult = GetStringInBetween(TranInqResponse, "<result>", "</result>", false, false);//It will give DualInquiry Result
                       string[] INQResAmount = GetStringInBetween(TranInqResponse, "<amt>", "</amt>", false, false);//It will give Amount
                       string[] INQResTrackId = GetStringInBetween(TranInqResponse, "<trackid>", "</trackid>", false, false);//It will give TrackID ENROLLED
                       string[] INQResPayid = GetStringInBetween(TranInqResponse, "<payid>", "</payid>", false, false);//It will give payid
                       string[] INQResRef = GetStringInBetween(TranInqResponse, "<ref>", "</ref>", false, false);//It will give Ref.NO.
                       string[] INQResTranid = GetStringInBetween(TranInqResponse, "<tranid>", "</tranid>", false, false);//It will give tranid                                  
   
   
                       //UPDATE THE PAYMENT RESPONSE IN DB BASED ON PAYMENT STATUS   
                       //switch (INQCheck[0].Trim())
                       //{
                       //    case "CAPTURED":
                       //    break;
                       //    case "APPROVED":
                       //    break;
                       //    case "SUCCESS":
                       //    break;
                       //    default:
                       //    break;
                       //}
   
                       Response.Clear();
                      
                       //REDIRECT TO OTHER PAGE OR SHOW THE PAYMENT STATUS ON THE SAME PAGE
                       Response.Write("REDIRECT=" + strURL);
                       Response.End();           
                     
                   }
                   else
                   {
                       // PAYMENT NOT SUCCESSFUL
                       // REDIRECT TO ERROR PAGE              
                   }
                   }
               }
               catch (Exception ex)
               {
                   // REDIRECT TO ERROR PAGE IN CASE OF ANY ERROR
               }
               }
           }
           else
           {
               // REDIRECT TO ERROR PAGE IF PAYMENT IS NOT SUCCEEDED
           }
           }
           else
           {
           // REDIRECT TO ERROR PAGE IF THE ERROR MESSAGE IS NOT NULL
           }
       }
   
       #endregion
   
   }
   
   public static string[] GetStringInBetween(string strSource, string strBegin, string strEnd, bool includeBegin, bool includeEnd)
       {
           string[] result = { "", "" };
           int iIndexOfBegin = strSource.IndexOf(strBegin);
           if (iIndexOfBegin != -1)
           {
               // include the Begin string if desired
   
               if (includeBegin)
               {
                   iIndexOfBegin -= strBegin.Length;
               }
               strSource = strSource.Substring(iIndexOfBegin + strBegin.Length);
               int iEnd = strSource.IndexOf(strEnd);
               if (iEnd != -1)
               {  // include the End string if desired
                   if (includeEnd)
                   { iEnd += strEnd.Length; }
                   result[0] = strSource.Substring(0, iEnd);
                   // advance beyond this segment
                   if (iEnd + strEnd.Length < strSource.Length)
                   { result[1] = strSource.Substring(iEnd + strEnd.Length); }
               }
           }
           else
           // stay where we are
           { result[1] = strSource; }
           return result;
       }//String function end
   
   

C# Convert Linq to Data Table

1. Use the Following Method to Convert your Linq object to Datatable.

public static DataTable LinqToDataTable<T>(IEnumerable<T> varlist)
        {
            DataTable dt = null;

            if (varlist == null)
                return dt;
            else
                dt = new DataTable();

            PropertyInfo[] props = null;

            foreach (T row in varlist)
            {
                if (props == null)
                {
                    props = ((Type)row.GetType()).GetProperties();

                    foreach (PropertyInfo pi in props)
                    {
                        dt.Columns.Add(pi.Name, typeof(String));
                    }
                }

                DataRow dr = dt.NewRow();

                foreach (PropertyInfo pi in props)
                {
                    dr[pi.Name] = pi.GetValue(row, null) == null ? DBNull.Value : pi.GetValue(row, null);
                }
                dt.Rows.Add(dr);
            }

            return dt;
        }