using System;

public class Program

{

    public static void Main()

    {

        var apikey = "test_sanhiew:B-qa2-0-60794a7d-0-302d021458bea94fec0e4d5b833ce78b044e4f7507269fd802150080fc9c6674c370bb651762b824fa699c905574d8";

        byte[] toEncodeAsBytes = System.Text.UnicodeEncoding.UTF8.GetBytes(apikey);

        Console.WriteLine(Convert.ToBase64String(toEncodeAsBytes));

    }

}