Install Apps
Whenever you buy an app or download a free one that you’ve never downloaded before, the App Store will ask you for confirmation so it knows you’re the one who wants to download the said app.
To verify your identity, you’ll need to either enter your Apple ID password or use Face ID or Touch ID. However, if you’re using Face ID, you’ll need to quickly double-press the side button to confirm the purchase, similar to how you open Apple Pay. This ensures you don’t make an accidental purchase just by looking at your phone.