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Researchers find Visa contactless payment 'security flaw'

1 November 2014 Last updated at 10:41 GMT

Researchers claim they have found a security flaw with Visa contactless payment cards.

In the UK, people can make purchases up to £20 by just touching the card against a machine - without needing to enter a PIN.

However, the researchers say that a glitch means Visa's cards will approved unlimited spending if it is put through in a foreign currency.

Dan Johnson reports.