Adam,
The insecurity of a new contactles card payment system here has featured on at least two BBC consumer affairs programmes. Understandably they emphasis the ordinary customer being vulnerable, even a person passing a terminal. I expect criminals will be studying what they can gain, but to date the purchase limit is very low (about US$15 IIRC).
Link:http://www.bbc.co.uk/programmes/b01shqc7Marks & Spencer have equipped their tills with not just card readers but with dual function M&S card readers. They accept contactless cards in the same terminal as normal Chip and PIN transactions. But who decides which card is used to pay? The customer - or the terminal? Many listeners tell us the machine takes the payment from a random contactless card in their wallet before they put their chosen card into the machine.
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