If I understood well, it's around using NFC for payment indeed. Developers do not get access to the low-level NFC interface but a set of APIs that allows to us

If I understood well, it's around using NFC for payment indeed. Developers do not get access to the low-level NFC interface but a set of APIs that allows to use NFC, but in a restricted way. Apple does not seem to allow developers to use contact-less payment, making Apple Pay a monopoly on iOS, hence the antirtrust case.