9F70

Card Interface and Payment Capabilities is Amex's own Kernel 4 declaration of which interfaces a card supports and how it behaves under delayed authorization - the interface bits in byte 1 (manually keyed entry, physical magnetic stripe, contact EMV, contactless EMV, mobile, and an explicit flag for mag-stripe mode NOT being supported) are conceptually parallel to what Terminal Capabilities (9F33, covered earlier) declares from the terminal's side, but this is the card stating its own interface support rather than the terminal's. Byte 2 is specific to Amex's delayed-authorization model: whether delayed-authorization usage information is present at all, and whether the card is valid for domestic versus international terminals performing delayed contactless authorization - a scenario, transacting offline now with authorization confirmed later, that isn't part of the core EMV specification and is defined entirely within Kernel 4's own transit- and low-value-friendly design. It's genuinely Amex-scoped: defined in EMVCo Book C-4 with brand data explicitly showing no Visa or Mastercard equivalent, related to the Amex-specific Contactless Reader Capabilities (9F6D) and the multi-brand-overloaded 9F6E, both flagged for human review rather than covered in this batch, and to Terminal Type (9F35, covered earlier) for the attended/unattended context that delayed authorization is most relevant to. See EMV Contactless Book C-4.