How can we return deduct amount in same website by using Paypal Payflow pro account.

protected NameValueCollection httpRequestVariables()
   {
       var post = Request.Form;       // $_POST
       var get = Request.QueryString; // $_GET
       return Merge(post, get);
   }

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string output = "";
            if (httpRequestVariables()["RESULT"] != null)
            {
                HttpContext.Current.Session["payflowresponse"] = httpRequestVariables();
                output += "<script type=\"text/javascript\">window.top.location.href = \"" + url + "\";</script>";
                BodyContentDiv.InnerHtml = output;
                return;
            }

var payflowresponse = HttpContext.Current.Session["payflowresponse"] as NameValueCollection;
            if (payflowresponse != null)
            {
                HttpContext.Current.Session["payflowresponse"] = null;

                bool success = payflowresponse["RESULT"] == "0";
                if (success)
                {
                    output += "<span style="font-family:sans-serif;font-weight:bold;">Transaction approved! Thank you for your order.</span>";
                }
                else
                {
                    output += "<span style="font-family:sans-serif;">Transaction failed! Please try again with another payment method.</span>";
                }

public string print_r(Object obj)
       {
           string output = "<pre>\n";
           if (obj is NameValueCollection)
           {
               NameValueCollection nvc = obj as NameValueCollection;

               output += "RESULT" + "=" + nvc["RESULT"] + "\n";
               output += "PNREF" + "=" + nvc["PNREF"] + "\n";
               output += "RESPMSG" + "=" + nvc["RESPMSG"] + "\n";
               output += "AUTHCODE" + "=" + nvc["AUTHCODE"] + "\n";
               output += "CVV2MATCH" + "=" + nvc["CVV2MATCH"] + "\n";
               output += "AMT" + "=" + nvc["AMT"] + "\n";

           }
           else
           {
               output += "UNKNOWN TYPE";
           }
           output += "";
       }