ATC or Application Transaction Counter is maintained by the Chip Card application (incremented by the chip), that provides a sequential reference to each transaction.

Unusual values may indicate data copying or other fraud to the Card Issuer:

  • a duplicate ATC
  • a decrease in ATC
  • a large jump in ATC

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« This page (revision-1) was last changed on 04-Mar-2015 12:07 by jim