using System;

​

public class Connection 

{

    public void Disconnect()

    {

    }

}

​

public class AuthToken

{

}

​

public class Message

{

    public string Content {get; set;}

    public Message(string content)

    {

        this.Content = content;

    }

}

public class NotificationServer

{

    public Connection Connect(string ipAddress)

    {

        return new Connection();

    }

    public AuthToken Authenticate(string appID, string key)

    {

        return new AuthToken();

    }

    public void Send(AuthToken token, Message message, string target)

    {

        Console.WriteLine(message.Content);

    }

}

​

public class NotificationService

{

    public void Send(string message, string target)

    {

        var server = new NotificationServer();

        var connection = server.Connect("ip");

        var authToken = server.Authenticate("appId", "key");

        server.Send(authToken, new Message(message), target);

    }

}

public class Program

{

    public static void Main()

    {

        var service = new NotificationService();

        service.Send("Hello World", "target");

    }

}