using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        MD5 md5Hash = MD5.Create();

SHA256 sha256 = SHA256.Create();

string formattedDateTime = DateTime.UtcNow.ToString("yyyyMMddHHmmssfff");

        Console.WriteLine(formattedDateTime);

byte[] urlInBytes = Encoding.UTF8.GetBytes("https://portal.nedsecure.co.za/api/merchant/configuration?mode=test");

byte[] timeStampInBytes = Encoding.UTF8.GetBytes(formattedDateTime);

byte[] hashedPasswordInBytes =

md5Hash.ComputeHash(Encoding.UTF8.GetBytes("Blue2583!"));

byte[] token = new byte[urlInBytes.Length + timeStampInBytes.Length +

hashedPasswordInBytes.Length];

Buffer.BlockCopy(urlInBytes, 0, token, 0, urlInBytes.Length);

Buffer.BlockCopy(timeStampInBytes, 0, token, urlInBytes.Length, timeStampInBytes.Length);

Buffer.BlockCopy(hashedPasswordInBytes, 0, token, urlInBytes.Length +

timeStampInBytes.Length, hashedPasswordInBytes.Length); 

byte[] hashedTokenInBytes = sha256.ComputeHash(token);

string base64Token = Convert.ToBase64String(hashedTokenInBytes);

        Console.WriteLine(base64Token);

    }

}