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
       }
       }
   }