A features is an access grant that allow an app to access specific types of data through Meta's various APIs. These features cannot be granted to an app by an app user but are active or inactive depending on the app user's relationship to the app and the app's review status.
For apps that are not approvedfor a feature in Meta App Review, the feature is only active for app users who have a role on the app or a role in a business portfolio that has claimed the app. Exceptions are Page Public Content Access and Page Public Metadata Access.
For apps that are approved for a feature in Meta App Review, the feature is active for all app users.
Learn more about developing with Meta with the following guides: