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   
       }
   }