using System;

public class Program

{

    public static void Main()

    {

        string test = HMACSHA256("3081000BRLtest_customer@p4f.comcei0C7wW5d6D", "7839793");

        Console.WriteLine(test);

    }

    public static string HMACSHA256(string stringToBeEncripted, string encriptionKey)

    {

         byte[] secrectKey = System.Text.Encoding.UTF8.GetBytes(encriptionKey);

         using (System.Security.Cryptography.HMACSHA256 hmac = new System.Security.Cryptography.HMACSHA256(secrectKey))

         {

             hmac.Initialize();

             byte[] bytes_hmac_in = System.Text.Encoding.UTF8.GetBytes(stringToBeEncripted);

             byte[] bytes_hamc_out = hmac.ComputeHash(bytes_hmac_in);

             string str_hamc_out = BitConverter.ToString(bytes_hamc_out);

             str_hamc_out = str_hamc_out.Replace("-", "");

             return str_hamc_out;

         }

    }

}