RFID app

Is there any IQ software support for RFID? I know about Garmin Pay, I can pay using my watch, but I need my watch act as simple RFID tag (e.g. sending RFID Chip no.).

I have several scenarios for this function - act as door opener, using it at the entrance of my swimming pool (as well as lock my cabinet), act as my ski card when skiing etc.

The watches have to be able to send RFID signals, because of payment card. This solutions is harder since the transmitting data is changing.  But I cannot find much simpler solution for just sending one and still the same Chip No.

Thanks for any help.