using System;

using OtpNet;                   

public class Program

{   

    public static void Main()

    {

        //the secret key can be provided by vendor 

        var secretKey= Base32Encoding.ToBytes("mfivkmsxgbvg6ylq");

        var totp = new Totp(secretKey);

        var otp = totp.ComputeTotp();

        Console.WriteLine(otp);

    }

}