How about:
Verify
Numbner
confirm/deny
The requesting bot gets the confirm or deny back.
Everything else is context driven. These two cards are exchanging their owner and clerk are right on the spot, or the owners had previously tapped their cards on the icon having the identified context. It is built in, bot transact because they know the context.n So all the rest is 'out of band', it is the setup when you look over your accounts and change some accounts manually.
Since the bots are guaranteed to maintain accounts, any other confirmation or additional data is redundant. Remember, this smart card simply emulates paper money, down to the trademark. It knows nothing of banks.
Make it simple, makes it secure. Thieves have the extra step, recovering context so the stolen transactions can be marked. Your card will be tracking purchases by category, well segmented categories. We can build more complex bot actions on top, as long as both bots agree to context, out of band.
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