Face ID while in App Store
Using Face ID to down apps
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Click on the link to read the document: 'Use Face ID on your iPhone or iPad Pro' --> https://support.apple.com/HT208109
In the iTunes Store, App Store, and Book Store in Apple Books
"You might be asked to enter your Apple ID password for the first purchase you make in the iTunes Store, App Store, or Book Store."
'If Face ID isn't working on your iPhone or iPad Pro', click here --> https://support.apple.com/HT208114
"If you need to enter your passcode
You might need to enter your passcode or Apple ID instead of using Face ID in these situations..."