CoreNFC (iOS / iPadOS)

Detect, read, and write NFC tags on iPhone (7 and later; background reading iPhone XS and later). Two session types, both built on NFCReaderSession:

• NFCNDEFReaderSession — high-level NDEF read/write. Use for NFC Forum Type 1–5 tags carrying URLs, text, vCards. Simplest path.

• NFCTagReaderSession — low-level access to .iso7816, .iso15693, .feliCa, .miFare tags for raw commands/APDUs (transit, access cards, custom protocols).

• Not CoreNFC: Apple Pay / Wallet passes are on the Secure Element and unreadable by third-party apps — see passkit. Host Card Emulation is a separate entitlement + CardSession API, out of scope here.

• KMP: CoreNFC is iOS-only; expose a commonMain interface and bind a Swift actual (see expect-actual, kmp-ios-integration). Keep tag payloads/secrets off shared plaintext — route sensitive material through swift-security.

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