Terminal Transaction Qualifiers (TTQ)

What it is

The Terminal Transaction Qualifiers (TTQTerminal Transaction QualifiersEMV tag 9F66 — a 4-byte bitmap the contactless reader sends to the card, declaring what the terminal supports and requires.View in glossary →) is a 4-byte contactless bitmap that a reader presents to the card (usually via the PDOL) to declare what it supports and requires: MSDMagnetic-Stripe DataA legacy contactless mode that emulates magnetic-stripe track data instead of doing full EMV chip processing. Largely deprecated.View in glossary → / qVSDCQuick VSDCVisa’s fast contactless profile (Tap to Pay): a streamlined EMV flow that finishes the card exchange in a single tap.View in glossary → path support, online capability, CVMCardholder Verification MethodHow the cardholder is verified — for example offline PIN, online PIN, signature, or no CVM required.View in glossary → requirements and issuer-update support. The card reads it to choose the contactless path and CVMCardholder Verification MethodHow the cardholder is verified — for example offline PIN, online PIN, signature, or no CVM required.View in glossary →.

Although it originated in the Visa (Kernel 3) specification, several kernels reuse the same tag with their own bit conventions, so always decode it in the context of the active kernel.

Where it appears

Set by the reader; sent to the card in GET PROCESSING OPTIONS (via the PDOL).

Specification reference

Defined in: EMVCo Contactless Book A (§5.7) and Book C-3 (Kernel 3 / Visa); also used by Kernels 6 and 7

Bit-level definitions below follow: EMV Contactless Book A §5.7, Table 5-4 (also Book C-3) — Terminal Transaction Qualifiers (4 bytes)

Bit & value breakdown

Example values

Meaning by contactless kernel

Decode & build this tag

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