title: Use TouchID to add fingerprints that are only used within the app
body: <p>The idea is that when the app launches, two people scan their fingers. Later, when one of those people uses TouchID, something happens. I know how to use TouchId to verify the owner of the phone, but I can't find any info on temporary storing scanned prints and using them for purposes other than verifying the owner.</p>
  
  <p>Can this be done? If yes, can someone point me in the right direction of implementing this.</p>
  
  <p>Thank you for your answers!</p>