Sticker Packs do not allow developers to collect usage or analytics through the use of 3rd party tracking libraries. Apple, however, collects some usage data from devices whose users have opted in to share such information with 3rd party developers. In short, sticker packs cannot collect data, so I do not collect any personal data about your purchase. Payments are processed and fulfilled by Apple via the App Store.
Please visit http://www.apple.com/legal/privacy for more information on what is collected by Apple.