Version 1.2 of the Register API is now available on iOS as of Square Register version 4.53.
Version 1.2 includes:
Support for linking customers to transactions using the new
CARD_ON_FILEtender type to allow charging a previously-stored card instrument. Learn more about how to use Card on File with Square.
For more information:
See Register API Overview for an overview of how the Register API works.
See Using the Register API for iOS to learn how to add Register API functionality to your iOS app.
See the SquarePointOfSaleSDK-iOS repository for the easiest solution to add Register API to your iOS app.