The security test scheme includes a set of test requirements whose satisfaction by the merchant entity is sufficient to ensure compliance with a multiple sets of {HEAD ~ security requirements} defined by {TAIL ~ multiple payment processing organizations} 
defined by
The security test scheme includes a set of test requirements whose satisfaction by the merchant entity is sufficient to ensure compliance with a multiple sets of { HEAD ~ security requirements } defined by { TAIL ~ multiple payment processing organizations }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL