The present invention concerns a system for exchanging {HEAD ~ data} between {TAIL ~ a portable payment terminal} and a stationary base terminal which is capable of being in communication with a payment center 
The present invention concerns a system for exchanging { HEAD ~ data } between { TAIL ~ a portable payment terminal } and a stationary base terminal which is capable of being in communication with a payment center
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH