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