How do I use the iOS In App Purchases API with Unity?

I’ve been looking around, and can only seem to find find posts from a few years back when In-App-Purchases weren’t handled by Apple. How would I go about using their API for purchases now? Is there any Unity addon/plugin or function that calls it up if your app is able to handle pruchases from within itself?

Check out Prime31’s StoreKit plugin: http://www.prime31.com/unity/