using System;

​

using System.Net; 

using System.Text; 

using System.IO;

public class Program

{

    public static void Main()

    {

        String testxml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"+

                        "<SecurePayMessage>"+

                        "<MessageInfo>"+

                        " <messageID>8af793f9af34bea0cf40f5fb79f383</messageID>"+

                        " <messageTimestamp>20042403095953349000+660</messageTimestamp>"+

                        " <timeoutValue>60</timeoutValue>"+

                        " <apiVersion>xml-4.2</apiVersion>"+

                        "</MessageInfo>"+

                        "<MerchantInfo>"+

                        " <merchantID>ABC0001</merchantID>"+

                        " <password>pesyfaun</password>"+

                        "</MerchantInfo>"+

                        "<RequestType>Echo</RequestType>"+

                        "</SecurePayMessage>";

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://api.securepay.com.au/xmlapi/payment");

        request.KeepAlive = false;

        request.Method = "POST";

        // turn our request string into a byte stream

        byte[] postBytes = Encoding.ASCII.GetBytes(testxml);

        // specify type 

        request.ContentType = "application/x-www-form-urlencoded";

        request.ContentLength = postBytes.Length;

        Stream requestStream = request.GetRequestStream();

        // now send it

        requestStream.Write(postBytes, 0, postBytes.Length);

        requestStream.Close();

        // get the response 

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        Console.WriteLine(new StreamReader(response.GetResponseStream()).ReadToEnd());

    }

}