On Tuesday, the second beta version of iOS 8.1 was released to developers. Unlike the first beta, which was released about a week ago, this one doesn’t provide any user interface changes. Based on what Apple put in their notes and after scrubbing the software, there are only bug fixes in this update. It appears that some developers can run a modified version of iOS 8.1, though, and are able to see the new Apple Pay system setup.
Developers running a modified version of iOS 8.1. have discovered that credit cards added to Passbook go through a similar method as when users want to add passes or tickets to the app. Credits cards can either be added manually or scanned in with the user’s camera. Unfortunately most developers don’t have access to Apple Pay because testing is likely still being done behind the scenes. Once Apple announces the release date for the public version at their event, they may also announce that developers can start using Apple Pay immediately (with a third beta version of iOS 8.1).
Developers can download the update over-the-air on their registered devices or from the developer portal.