They've expanded the API quite a bit in iOS 14 and you can now also write certain NFC tags: https://developer.apple.com/documentation/corenfc/creating_nfc_tags_

They've expanded the API quite a bit in iOS 14 and you can now also write certain NFC tags: https://developer.apple.com/documentation/corenfc/creating_nfc_tags_from_your_iphone https://developer.apple.com/documentation/corenfc/creating_n... Still can't create payment apps though. No idea if this would be sufficient for an access control system.