question

I have to add a delay to get this simple program to work:

class Program : CloverConnectorListener
{
    CloverDeviceConfiguration cloverDeviceConfiguration;
    CloverConnector cloverConnector;

    Program()
    {
        cloverDeviceConfiguration = new TestCloverDeviceConfiguration();
        cloverConnector = new CloverConnector(cloverDeviceConfiguration);
        cloverConnector.AddCloverConnectorListener(this);
        **Thread.Sleep(5000);**
    }

    public int Sale(long amount) {
        SaleRequest saleRequest = new SaleRequest();
        saleRequest.Amount = amount;
        return cloverConnector.Sale(saleRequest);
    }

    static void Main(string[] args)
    {
        Console.WriteLine(new Program().Sale(7500));
        Console.ReadKey();
    }

See the bolded Thread.Sleep() for 5 seconds after creating the Connector and adding myself as a listener? If I take that out, calling Sale() simply returns -1 and nothing happens: no call to OnSaleResponse() in my listener. But nothing else is being called in the listener as far as I can tell. What do I need to do to get properly set up so that Sale() works without the delay?