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NameValueCollection data = new NameValueCollection();
data.Add("version", "4.1.11");
data.Add("amount", "3"); //Request["amount"]);
data.Add("currency", "EUR"); //Request["currency"]);
data.Add("net_account", "453501020503");//Request["AccountId"]);//txtCustomerAccountNumber.Text);
data.Add("secure_id", "908379"); //Request["SecurityCode"]); //txtSecurityId.Text);
data.Add("merchant_id", ""); //ConfigurationManager.AppSettings["merchant_id"]);
data.Add("merch_key", ""); //ConfigurationManager.AppSettings["merch_key"]);
data.Add("merch_transid", "hfghgdfhdf12312314ewd"); //Request["transreference"]);
data.Add("language_code", ...
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