Waitrose has apologised after customers were left unable to pay by card, Tuesday evening.
The supermarket chain has been one of the several sectors of activities affected by the failure of the network card of the machine of Verifone.
Clients in Birmingham and London were among those taking to social media, saying that they had been asked to pay with the money in Waitrose stores when the card system crashed.
Waitrose and Verifone said that the problem had been resolved.
A customer, David Iwanow, tweeted that the credit card payment system crashed in all Waitrose stores.
The end of the Twitter post by @davidiwanow
Another Twitter user, James Littlewood, said a Waitrose manager giving chocolates to people waiting in the check-out queue after the system crashed.
A Waitrose spokesman said: “We were among a number of companies affected by intermittent failures of their card payment system.
“The situation has been resolved, but we are very sorry to customers for the inconvenience.”
Verifone, which is based in the united states, but is available in more than 150 countries, said: “We have solved the problem and we are back online.”