in App Purchase

покупка внутри приложения; Возможность приобретать обновления компьютерной программы/приложения не выходя из самой программы/приложения (In-app purchase allows customers to purchase upgrades, new content, and complementary features directly within your app – without having to go back to the App Store or the Android Market. By simplifying and shortening the path to purchase, you’re more likely to keep your customer interested – and make a sale. In-app billing is the quickest and easiest way to monetize your app.)

покупка из приложения (A transaction performed by a consumer from within the context of an app to buy additional features for that app)