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ANSWER: The contents of tag 9F39 indicate the transaction entry mode. The tag's possible values (and their meanings) are shown in the table below. This table comes directly from ISO-8583 and is not specific to ID TECH. (ISO-8583 is an industry standard, and these are the standard values and meanings.)

PAN entry mode

PAN entry modeDescription
02Magnetic stripe
03Bar code
05Integrated circuit card (ICC). CVV can be checked.
07Auto entry via contactless EMV.

Fallback to Magnetic Stripe

90Magnetic stripe as read from track 2. CVV can be checked.
91Auto entry via contactless magnetic stripe
95Integrated circuit card (ICC). CVV may not be checked.

Same as original transaction.

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