> You can also use Touch ID instead of entering your Apple ID password to purchase content from the iTunes Store, App Store, and iBooks Store. You will be asked

> You can also use Touch ID instead of entering your Apple ID password to purchase content from the iTunes Store, App Store, and iBooks Store. You will be asked to scan your fingerprint with each purchase. How does this work exactly, if the fingerprint-pass is only stored locally on your device? Is the fingerprint acting only as a "master password", which means you still have to set-up your password for iTunes first?, and then it just re-uses that iTunes password after you used the fingerprint-master password? Because otherwise I'd have to assume Apple stores your fingerprint on their servers, in order to match your account with your fingerprint-as-password.