- https://github.com/leecrossley/cordova-plugin-game-center (adds+)
- http://ilee.co.uk/using-game-center-with-phonegap/
- https://coderwall.com/p/dln_ga
- https://www.youtube.com/watch?v=3kSOXLtGZMQ
- https://github.com/alexvillaro/PhoneGap-InAppPurchase-iOS
- https://github.com/floatinghotpot/cordova-plugin-appleiap
- https://github.com/KikeReto/PhoneGap-InAppPurchase-iOS
- http://playadds.com/
- uses in app purchases and game center