Example.cs

public class CourceService
{
    internal CourceService(siteId, apiKey)
    {
        // TODO: Handle params...
    }
}

// The CourseServiceFactory should be registered with the DI container
// and should be registered as a singleton
public class CourseServiceFactory
{
    public CourceService Create(string siteId, string apiKey) 
    {
        return new CourceService(siteId, apiKey);
    }
}