Standard fingerprint
Enrollment
Before using fingerprint for authentication, the app must get the user's consent.
App settings
App settings provide a way to turn fingerprint authentication on or off.
Authentication
Your app’s users can set up the option to sign in or authenticate purchases using fingerprint.
When a user action needs to be authenticated, display the Fingerprint authentication dialog in place of your sign-in screen or during a purchase interaction.
After enrollment
After enrollment, present the fingerprint dialog whenever you need authentication from the user.
During your app’s purchase flow
The user has the option to enroll their fingerprint right after making a purchase, using an existing account.