C# ReVerifyNow object not in namespace

I am trying doing as the example says (https://wyday.com/limelm/help/using-turboactivate-with-csharp/), but I can't build the ReVerifyNow type object, and I see it is not present in TurboActivator.cs.Can you please help me? Here's a pic: https://ibb.co/VLhR70HThank you.(I'm sorry it could be trivial but I'm under pressure right now and can't figure it out)

I have found a definition of such function in TurboActivate/API/CSharp/WPF .Any hints on how to procede?

(it was me up here ...)