When you buy an iTunes gift card and then decide to "pay" it off in the App Store, the camera on the iPhone, iPad or Mac can scan the code so you do not waste time doing manual typing. The mechanism is designed so cleverly that Apple uses a hidden font, and in addition to the text, frames around the code are recognized.

This conclusion came from the developers of the company Equinux, who tried to recognize the camera with codes with a different font and borders, but their attempts did not lead to anything. Experts found that the font itself is hidden deep in iTunes, but there was no information about it in the CodeRedeemer plugin. Two fonts - Scancardium and Spencardium, the developers found in the CoreRecognition framework. Framework. The first is used to enter and recognize codes, and the second - to hide credit card data.

Fonts can be installed on the same Mac in just a couple of clicks, and then used in various applications. To ordinary users, in general, such information is unlikely to be useful, but developers can create their own cards with promotional codes App Store, so that users recognize them in a standard application.

Usually iTunes gift cards are used to replenish the Apple ID cash account. With their help you can buy applications, movies, pay subscription to Apple Music, buy storage in iCloud and so on.