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Originally Posted by bob_builder
Cards with magnetic strips have been used in cash machines for a number of decades without needing the PIN to be stored on the strip.
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But such cards cannot be used off line. A C&P card can be charged (dependant upon the retailer) an amount withouth need for authorisation (below floor limit transactions).
If an ATM cannot contact the mothership then you cannot use the machine. If a C&P card cannot or need not contact the mothership then you can still have the transaction.