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