StoreKit complete sample

Hello All

I wanted to use the StoreKit sample available in the MarketPlace : https://marketplace.appcelerator.com/apps/6589?1536941625&restoreSearch=true#!overview

I succeed in running the sample in Sandbox mode.

But what it is missing in the example code is how to you had feature for your app. For example, if I want to remove Ads in an app, where do I need to place the code ? If I want to add feature in my app when people buy in app purchase, where do I need to code this ?

I really thank the people who will give me a sample.