using System;

using System.Linq;

​

public class Program

{   

    public static    string publicKey = "8Nienx8EIwNS97e51JAS";

    public static    string privateKey = "vKaDscWr6W4B8cMVUCpw";

​

​

    public static void Main()

    {

        Console.WriteLine("We need the pin code");

        string pinCode = "";

        Console.WriteLine("We need the transaction id");

        string transactionId = "";

        string generatedSignature = GenerateConfirmationSignature(transactionId, pinCode);

        Console.WriteLine($"The generated Signature:{generatedSignature}");

    }

    public static string GenerateConfirmationSignature(string TransactionId, string PinCode)

    {

        string contentToHash = string.Format("{0}{1}", TransactionId, PinCode);

        var hash = new System.Security.Cryptography.HMACSHA256(System.Text.Encoding.UTF8.GetBytes(privateKey));

        var correctHash = string.Join(string.Empty, hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(contentToHash)).Select(b => b.ToString("x2")));

        return publicKey + ":" + correctHash;

    }

}