In-app purchase of Apple Store in Ionic

I have a tutorial for implementing iOS In App Purchases in Phaser (a HTML5 game framework):

http://www.joshmorony.com/how-to-create-ios-in-app-purchases-with-phonegap-build/

Obviously not Ionic, but the concepts are the same, it's just using a PhoneGap plugin so it doesn't matter whether it's in Ionic or anything else - should get you started at least (also keep in mind that particular tutorial is for PhoneGap Build, but you can easily just use regular PhoneGap / Cordova).