Morrisons is investigating after some shoppers in its supermarket and cooperative stores struggled to make card payments.
Earlier, ACI, which handles payments for retailers, apologized for the inconvenience caused.
IT issues impacted card payments at Co-op and Morrisons, and it worked closely with both partners’ IT teams to resolve the issue as quickly as possible.
ACI said, “We apologize for any inconvenience caused to the buyer.”
A statement released Tuesday by Morrisons said: “We have no more problems with card payments and are working very closely with our partner ACI to investigate what happened.”
Many shoppers have turned to cards and contactless payments rather than cash during the coronavirus pandemic, although a recent study by the Bank of England found the risk of getting coronavirus off banknotes is low.
The BBC reported that the problem in some co-op stores resulted in self-service tills being closed and customers having to queue to be served at the staffed tills.
It was said that from Sunday long lines could be seen in the snow in front of some convenience stores of the cooperative and customers were asked to pay with cash.
The cooperative described the problem as intermittent and said it prevented only a small percentage of transactions from being processed.
Twitter users described long queues and customers running to an in-store ATM to pay.