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A “nationwide issue” has been affecting card payments.

Many social media users were reporting being unable to pay for their shopping in supermarkets this morning.

More than 600 people were flagging issues with Visa on Down Detector as of 9.45am, while over 100 had problems with Mastercard payments as of 10am.

A sign in one Sainsbury’s store was requesting customers pay for their shopping in cash.

The supermarket said on social media it had been aware of a “nationwide issue” with card payments.

Vanessa Meehan, in Twickenham, said: “I’ve just been turned away at Sainsbury’s as they can’t accept card payments. Petrol station also coned off. The car is running on fumes and I need to get supplies.”

A Sainsbury’s spokesperson told Sky News at 11am that contactless payments had resumed after being “briefly unavailable for a few minutes this morning”.

They said this was caused by an issue with its third-party payment provider.

“We’re accepting all payments as usual and continue to monitor the situation. We’re sorry for any inconvenience this may have caused,” the supermarket said.

Asda also confirmed its payment systems were back up and running following temporary issues with Visa.

A Visa spokesperson confirmed to Sky News it had been aware cardholders were experiencing issues when making payments.

“While Visa’s systems are operating normally, we are working with our partners to investigate,” they added.

Mastercard said it was “aware of some payment transaction issues at select merchants in the UK” and was working to gather more information.

“There is no current indication that these issues are related to our network,” a spokesperson said.