First Data Web Service API Integration Problem

Hi,

I'm trying to use the First Data Global Gateway web service API. I was able to reverence the WSDL file in VS and get the classes to show up. I get the error "Object reference not set to an instance of an object." I can't figure out what I'm doing wrong.

FDGGWSApiOrderService OrderService = new FDGGWSApiOrderService();
        OrderService.Url = @"https://ws.merchanttest.firstdataglobalgateway.com/fdggwsapi/services/order.wsdl";
        OrderService.ClientCertificates.Add(X509Certificate.CreateFromCertFile(ConfigurationManager.AppSettings["Keyfile"]));
        NetworkCredential nc = new NetworkCredential(ConfigurationManager.AppSettings["CredUser"], ConfigurationManager.AppSettings["CredPass"]);
        OrderService.Credentials = nc;
        FDGGWSApiActionRequest ActionRequest = new FDGGWSApiActionRequest();
        RecurringPayment recurring = new RecurringPayment();
        // Sets for new recurring payment
        recurring.Function = RecurringPaymentFunction.install;
        // Info for Recurring Payment
        RecurringPaymentInformation recurinfo = new RecurringPaymentInformation();
        recurinfo.InstallmentCount = "99";
        recurinfo.InstallmentFrequency = "1";
        recurinfo.InstallmentPeriod = RecurringPaymentInformationInstallmentPeriod.year;
        recurinfo.MaximumFailures = "3";
        DateTime date = DateTime.Now;
        string strDate = date.ToString("yyyyMMdd");
        recurinfo.RecurringStartDate = strDate;
        recurring.RecurringPaymentInformation = recurinfo;
        // Card Data
        CreditCardData CardData = new CreditCardData();
        CardData.ItemsElementName = new ItemsChoiceType[] { ItemsChoiceType.CardNumber, ItemsChoiceType.ExpMonth, ItemsChoiceType.ExpYear, ItemsChoiceType.CardCodeValue };        
        CardData.Items = new string[] { "4111111111111111", "05", "2015", "598" };
        // Next line is where the ERROR occurs
        recurring.TransactionDataType.Item = CardData;
        // Add Billing Address
        Billing BillAddr = new Billing();        
        BillAddr.Name = "Kris Scheppe";        
        BillAddr.Address1 = "3446 Marinatown Ln.";
        //BillAddr.City = txtCcCity.Text;
        BillAddr.City = "Fort Myers";        
        BillAddr.State = "FL";        
        BillAddr.Zip = "33080";
        BillAddr.Country = "US";
        recurring.Billing = BillAddr;
        // Set the Order Id        
        recurring.OrderId = "1590";
        // Set Payment Amount
        Payment charge = new Payment();        
        charge.ChargeTotal = 120.00M;
        recurring.Payment = charge;        
        TransactionDetails txnDetails = new TransactionDetails();        
        txnDetails.OrderId = "21";        
        txnDetails.PONumber = "2106";
        recurring.TransactionDetails = txnDetails;
        FDGGWSAPI.Action action = new FDGGWSAPI.Action();
        action.Item = recurring;
        ActionRequest.Item = action;
        // Get the Response
        FDGGWSApiActionResponse response = null;
        OrderService.FDGGWSApiAction(ActionRequest);
        if (response.ProcessorResponseMessage == "APPROVED")
        {
            MultiView1.SetActiveView(vwSuccess);
        }
        else
        {
            lblError.Text = response.ErrorMessage;
            lblStatus.Text = response.TransactionResult;
            MultiView1.SetActiveView(vwFailure);
        }

Any help you can provide would be appreciated.

Thanks,

its4net