Revolut customers were left unable to use features of their banking apps on Friday due to technical issues.
The challenger bank, which has more than 200,000 customers in Ireland and in excess of 4.5 million worldwide, said it was suffering from a "technical issue" causing problems with some transactions.
"We are currently experiencing a technical difficulty which is causing some card payments and top-ups to fail or appear as 'pending'. Our team is working to fix this and we expect to be back to normal very soon. We're sorry for the temporary inconvenience," it said after the outage.
Revolut later said on Twitter that the issue had been fixed, although some customers were still experiencing problems in the afternoon.