Don’t know if this is possible to implement or not but now that we can open a saved NFC dump and update it from the initial card it would be VERY COOL to open for emulation a card and when doing so select an update from reader so that the emulated card would save the changes made to it by the reader/system …
Example on a card with 5 units of credit used on a machine if you use one credit the machine would decrese the card count to 4 and save that on the card, it would be nice to be able to have such card emulated on flipper and have flipper react to the changes done by the reader/system and emulate/save the changes …
Goes without saying might be impossible due to hardware limitations or the diversity of readers using different methods to change the cards but yet if possible it would be very cooooolll !