In-App Purchase with StoreKit
Throughout this book, we have been working with both Game Center and Game Kit to add rich social networking into your apps. However, there is another important feature slowly becoming more popular in modern software: in-app purchases. Allowing your users to purchase upgrades or additional content for your app, from directly within your app, opens up a potentially significant new revenue stream. Over the past few years, a new business model has emerged called Freemium. Freemium is a new type of game or product that is offered to your users for free, but is monetized through selling add-ons.
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