using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var key = Encoding.UTF8.GetBytes("UME-SECRET-KEY");

        var data = Encoding.UTF8.GetBytes("customer-xyz123embrulla1.2.3br-feature-xxyy");

        using (var hmac = new HMACSHA256(key))

        {

            var hashBytes = hmac.ComputeHash(data);

            var hex = BitConverter.ToString(data).Replace("-", string.Empty);

            Console.WriteLine(hex);

        }

    }

}