You may be having problems with your Visa card.
By around 10pm Visa said service returned to normal saying the issue was a result of a hardware failure.
Marks & Spencer said: "We are unable to accept Visa card payments now".
Alex Neill of Which? said: "Clearly this issue will be a huge inconvenience to customers and it must be resolved urgently. Not knowing when this is going to be sorted out is incredibly frustrating".
"This incident is preventing some Visa transactions in Europe being processed", the statement said.
"ATM and Mastercard transactions are not impacted".
She was flustered trying to pay her bill and then add the extra value points to her loyalty card at the Customer Service desk.
Paymentsense provides transaction services to over 60,000 independent businesses across the United Kingdom and Ireland.
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A statement from the company, released in the early hours of Saturday morning, claims that all payments are processing normally once more.
The Visa network is relied upon worldwide to process payments.
If you're about to use your Visa card to pay for something in Europe, you may want to use cash instead.
"For that we can only apologise and we are working hard until we're able to resolve it".
"I didn't have cash on me so I had to drive all the way home".
Image: Shops quickly filled up as customers had issues paying with Visa cards.
A spokesman for the retailer said: "The issue is intermittent, so it's not all cards, it's not all stores and it's not all checkouts".