Console App into windows service using c#

Question

I am trying to convert my console application into windows service using .net4.8. I used the topshelf to create a service. The frequency of my service will be every minute. I don't know if I am doing it correctly to call the method within the constructor APIService. Here's my code:

APIService.cs

    public APIService()
{
    // code here for login in the application
     
    // calling the method class
    SAPAPI.PostRequest(uri);
    SLMAPI.PostRequest(uri);

    _timer = new System.Timers.Timer(60) { AutoReset = true };
    _timer.Elapsed += TimerElapsed;
}

private void TimerElapsed(object sender, System.Timers.ElapsedEventArgs e)
{
    string[] lines = new string[] { DateTime.Now.ToString() };
    File.AppendAllLines(@"C:\ProgramData\temp\Timer.txt", lines);
}

public void Start()
{
    _timer.Start();
}

public void Stop()
{
    _timer.Stop();
}

Program.cs

    static void Main(string[] args)
{
    var exitCode = HostFactory.Run(x => 
    {
        x.Service<APIService>(a => 
        {
            a.ConstructUsing(apiservice => new APIService());
            a.WhenStarted(apiservice => apiservice .Start());
            a.WhenStopped(apiservice => apiservice .Stop());
        });

        x.RunAsLocalSystem();

        x.SetServiceName("ClientWindowService");
        x.SetDisplayName("Client Window Service");
    });

    int exitCodeValue = (int)Convert.ChangeType(exitCode, exitCode.GetTypeCode());
    Environment.ExitCode = exitCodeValue;
}

Have I done it correctly? Does it automatically trigger the service every minute based on my code? Thank you in advance for your help.