The Pass Kit API for Apple’s Passbook app in iOS 6 enabled developers to create and manage passes, which are digital versions of loyalty cards, gift cards, tickets, and other types of passes. The Pass Kit API provides a way for developers to create passes that can be stored and managed in the Passbook app on iOS devices, and it allows users to easily access and use their passes from a central location.

Some of the specific functionality enabled by the Pass Kit API in iOS 6 includes:

1. Pass creation: Developers can use the Pass Kit API to create passes in various formats, including boarding passes, event tickets, and store cards. Passes can include custom images, barcodes, and other data that is specific to the pass type.
2. Pass updates: Passes can be updated over the air, allowing developers to push changes to the passes without requiring users to download a new version of the app.
3. Pass distribution: Developers can distribute passes through various channels, including email, SMS, and web links.
4. Pass management: Users can manage their passes from within the Passbook app, including adding new passes, deleting old ones, and organizing them into groups.
5. Pass location-based notifications: Developers can use the Pass Kit API to trigger location-based notifications when a user is near a specific location, such as a store or event venue.

Overall, the Pass Kit API provides a powerful set of tools for developers to create and manage digital passes, and it allows users to easily access and use their passes from a central location.