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Credential provider extensions
In iOS, iPadOS and macOS, users can designate a participating third-party app as a credential provider for Password AutoFill in Passwords settings (iOS and iPadOS) or in Extensions settings in System Preferences (macOS). This mechanism is built on app extensions. The credential provider extension must provide a view for choosing credentials, and the extension can optionally provide metadata about saved credentials so they can be offered directly on the QuickType bar (iOS and iPadOS) or in an autocomplete suggestion (macOS). The metadata includes the website of the credential and the associated username but not its password. iOS, iPadOS and macOS communicate with the extension to get the password when the user chooses to fill a credential into an app or a website in Safari. Credential metadata is stored inside the credential provider app’s container and is automatically removed when an app is uninstalled.