PKPass

PKPass is the format of tickets, coupons, and loyalty cards used in the iOS Passbook app. It is a ZIP-format archive (but using the .pkpass extension instead of .zip) containing JSON-format data along with some PNG-format images. The files within the archive have specific expected names to denote their function.

Links

 * Pass file format
 * Package structure (gives filenames to be used)
 * PKPass class reference
 * PassWallet for Android