What Are Needed To Setup Unity IOC Container For Implementing DI In Web API 2

I have looked at several tutorials for setting up Unity Container for Web API 2 for the purpose of implementing Dependency Injection but they all used older versions of Unity so they don't help my situation. The version of Unity I am using is Unity.Asp.Net.WebApi 5.0.11.

It only created two files in the APP_Start folder for me when I install it as far as I can see which are shown below:

UnityConfig.cs
UnityWebApiActivator.cs

I have registered my Types in the Application_Start() method but I still get errors when I run my code. The following are my Global.asax and UnityConfig files.

protected void Application_Start()
{
  GlobalConfiguration.Configure(WebApiConfig.Register);
}

public static void RegisterTypes(IUnityContainer container)
{
  container.RegisterType<IPayment, VisaPayment>();
  container.RegisterType<IPayment, MasterPayment>();
} 

I tried to add the following code to the Global.asax file but Visual Studio throws errors which basically said that they are objects which do not exist.

AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
BundleTable.Bundles.RegisterTemplateBundles();
Bootstrapper.Initialise();

Can someone please help point me to a web page that explains what I need to do to configure Unity for WebAPI 2, thanks.