This content was released on Nov 25 2015. The official support period is 6-months from this date.
This video will teach you how to integrate IAP into your app and accept purchases. You'll use your sandbox account to "make" a purchase to remove the ads in the GreenGrocer app.
This is a companion discussion topic for the original entry at https://www.kodeco.com/4158-in-app-purchase/lessons/3