title: Touch ID not showing StoreKit
body: <p>I'm using StoreKit for processing In-App purchases, which works perfectly. 
  My only issue which I couldn't find a solution online is: <br>
  In other apps when trying to do an IAP, I'm asked for Touch ID (so it's not my device set up wrong or so) while in my App it always asks for password. 
  How can I get Touch ID to work for authentication with iTunes?
  Thank you in advance!</p>