But what is it that your app actually sells?
A subscription that gets the users access to the price monitoring? Or do you give that away and then sell the ticket?
MattIPiFony
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If you mean can you communicate with the mobile phone SIM card, I believe not.
You can use CoreNFC to exchange arbitrary APDUs with a JavaCard applet via NFC, though.
The FIDO 2 specification does suggest that authenticators may support short exchanges via ISO7816-4 chaining.It indicates that if a request is sent to the authenticator with the short length, that the authenticator MUST respond short.It indicates that if a long request is sent the authenticator must respond with extended length APDUs. It's not clear whether an authenticator which supports only short APDUs and chaining is compliant.
MiFare Classic 4K? If it's MiFARE Classic they didn't build support for that (at least as yet).
No, at least not up to this point.Only Wallet/PassKit/Apple Pay have a way to do Host Card Emulation as of now.There's not an API for third party developers to do HCE.