What format and length does EMV tag 9F3D use?

Tag 9F3D uses the Numeric (BCD) format and is normally 1 bytes long.

Is tag 9F3D provided by the card or the terminal?

Tag 9F3D (Transaction Reference Currency Exponent) is provided by the Terminal.

9F3D

Transaction Reference Currency Exponent

Transaction Reference Currency Exponent completes the pairing already established elsewhere in this dictionary between a currency code and its decimal-places exponent, applied here to the Transaction Reference Currency Code (9F3C, referenced alongside it): it states how many decimal places the terminal's own reference-currency amount, 9F3A, actually uses. It's the terminal-side, single-currency counterpart to the card-side, multi-currency Application Reference Currency Exponent (9F43) covered earlier - simpler because the terminal only ever has one reference currency active at a time, unlike the card's list of several. Getting this exponent wrong produces the same silent decimal-misplacement failure mode already described for its sibling fields: a converted amount that looks numerically plausible in a log but is actually off by a power of ten from what the terminal's own risk logic intended to compare. See EMV 4.4 Book 3.

Interactive decoder

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Numeric (BCD): 02

This tag is not a bitmap; the decoder shows a format-based interpretation.

Decoded example

Example value: 02

Related tags

9F3C

Properties

Tag	9F3D
Name	Transaction Reference Currency Exponent
Format	Numeric (BCD)
Length	1 bytes
Source	Terminal
Templates	—
Books	EMV 4.4 Book 3

Frequently asked questions

What is EMV tag 9F3D?: Transaction Reference Currency Exponent completes the pairing already established elsewhere in this dictionary between a currency code and its decimal-places exponent, applied here to the Transaction Reference Currency Code (9F3C, referenced alongside it): it states how many decimal places the terminal's own reference-currency amount, 9F3A, actually uses. It's the terminal-side, single-currency counterpart to the card-side, multi-currency Application Reference Currency Exponent (9F43) covered earlier - simpler because the terminal only ever has one reference currency active at a time, unlike the card's list of several. Getting this exponent wrong produces the same silent decimal-misplacement failure mode already described for its sibling fields: a converted amount that looks numerically plausible in a log but is actually off by a power of ten from what the terminal's own risk logic intended to compare. See EMV 4.4 Book 3.
What format and length does EMV tag 9F3D use?: Tag 9F3D uses the Numeric (BCD) format and is normally 1 bytes long.
Is tag 9F3D provided by the card or the terminal?: Tag 9F3D (Transaction Reference Currency Exponent) is provided by the Terminal.

Sources

EMV_v4.4_Book_3_Application_Specification, p. 160

AID Parameter Table parser Public Key Table parser

All EMV tags

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