Dear Robert Watson,
can you give us more information about what you need do you have specific problems or need recommendation, by key you mean the keys stored in the reader or a reader or a keyless entry go, please give us more information so we can help you solve your problem or if it is a recommendation please give me more requirements for your project like nfc modes needed in the active device or specific ISO or the security needed in the tag, every detail you can give me to help you here will be good.
Have a great day !!
BR
Jonathan
