A set of {TAIL ~ security requirements} defining protocols for implementing commercial transactions over the shared network using instruments identified with {HEAD ~ the payment processing organization} is received from each of a plurality of payment processing organizations 
A set of { TAIL ~ security requirements } defining protocols for implementing commercial transactions over the shared network using instruments identified with { HEAD ~ the payment processing organization } is received from each of a plurality of payment processing organizations
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH