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Identifying Fallbacks with POS Entry Mode?

Question asked by scottpantall on Dec 14, 2017
Latest reply on Dec 21, 2017 by rbshevlin

I am working on having our system identify fallback transactions. The Worldpay ISO 8583 Reference Guide V2.25 shows 2 POS Entry Mode values for fallbacks:

  • 79 - "Fallback from Chip transactions when keying the prior voice authorization"
  • 80 - "Fallback from Chip to magnetic stripe"


What is the difference between the 2 codes? Does a "79" mean that, since there is prior voice authorization, the transaction is not suspicious?