Knapp can see a time not so far in the future when even taxi drivers will take plastic, as they do in London, punching them into meters that double as a card-reading machines.
His exemplary badges are typically 3 inches high and 4 inches wide, and enclosed in a plastic sleeve that can double as a business-card or room-key holder.
Since Indian ATMs don't require the double identification of RFID smart card and magnetic strip, just the strip, they were able to manage quite a bit of cash before a vigilant security guard spotted them making withdrawls from multiple cards in succession.