Touch Bar was installed from MacBook Pro (Late 2016). In addition, fingerprint authentication (Touch ID) can be used for “Apple Pay”, “iTunes”, and “Apple Store”, so it is a very convenient function.

How to add or remove Touch ID fingerprints on a Mac with Touch Bar

Touch ID settings

With Touch ID, you can unlock your Mac with your fingerprint and shop with Apple Pay, iTunes and the App Store.

Unlock Mac Apple Pay iTunes and App Store

Touch ID is now ‘on’. See here for how to use and set up the Touch Bar/Touch ID.

How to use and set up Touch Bar/Touch ID