Contactless card is a card for limited value transactions that one doesn't need to add a PIN on a POS, just tap on it, that's why they are also known as "tap-and-go" cards. (More info)
On my research, I have analyzed what is the idea that people have on: information sent between the card and card reader, the maximum amount one can pay with this type of cards, how many times one can use this type of card per day, if there are other alternatives (one example: smartphones), how do this last example works, what happens if I have multiple contactless cards in a wallet and what happens when one card is stolen.
What are some examples of conceptual models or user flow for this? How can I design a better conceptual model that would allow users to develop a better mental model of contactless cards (assuming that this is a desirable goal)?