receiving at a host computer system including a processor, from each of {HEAD ~ a plurality} of {TAIL ~ payment processing organizations}, a set of security requirements defining protocols for implementing commercial transactions over the shared network using instruments identified with the payment processing organization 
of
receiving at a host computer system including a processor , from each of { HEAD ~ a plurality } of { TAIL ~ payment processing organizations } , a set of security requirements defining protocols for implementing commercial transactions over the shared network using instruments identified with the payment processing organization
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH