Instagram: How to Use Face ID for Purchases on iOS

It's an alternative to your PIN

Instagram Shop began rolling out in the U.S. in July, giving users of the photo- and video-sharing application a way to browse and purchase items from brands without leaving the app. If you use a supported iOS device, you have the option to use Face ID to confirm purchases, rather than using your custom PIN (personal identification number). Our guide will show you how to turn this option on for future purchases.