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Nice idea, but I am sure all those that received double will get a letter informing them that 'an error was detected, and your account was not correctly debited, so we have corrected it for you'. If ...
Well not PKI, but I have always had a grudge about those digital tablet or handheld POS things you are sometimes asked to sign on top of. With all the talk about Chip + PIN, it reminded me... I m...