Visa said some card payments are currently failing across the UK and elsewhere in Europe.
The company said it is investigating the cause of the disruption.
The extent of the problem is not clear, but Visa customers across Europe have been complaining on Twitter that payments have been denied.
“We are investigating the cause and working as quickly as possible to resolve the situation,” Visa said in a statement.
The Payment Systems Regulator told the BBC it understood the problem to be limited to Visa card payments only.
Responding to customer complaints on social media, HSBC said there were issues with processing Visa payments, which were intermittent, but were “slowly recovering”.
First Bank told customers on Twitter there aren’t “any timescales for resolution at the moment”.
Source: BBC News