41.2 SiriKit Domains
When initially introduced, SiriKit could only be used with apps to perform tasks that fit into narrowly defined categories, also referred to as domains. With the release of iOS 10, Siri could only be used by apps when performing tasks that fit into one or more of the following domains:
•Messaging
•Notes and Lists
•Payments
•Visual Codes
•Photos
•Workouts
•Ride Booking
•CarPlay
•Car Commands
•VoIP Calling
•Restaurant Reservations
•Media
If your app fits into one of these domains then this is still the recommended approach to performing Siri integration. If, on the other hand, your app does not have a matching domain, SiriKit can now be integrated using custom Siri Shortcuts.