At the POS, the user invokes {TAIL ~ the application} and then inputs a biometric trait to {HEAD ~ the phone} 
At the POS , the user invokes { TAIL ~ the application } and then inputs a biometric trait to { HEAD ~ the phone }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD