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