Fellow payment card systems MasterCard and Maestro are not affected.
Paymentsense, which processes payments for small businesses in the United Kingdom, claimed Visa had informed it that the outage was over and that the problems were being caused by a backlog.
Some Visa transactions are not being processed due to a service disruption, the company has said. Right now, it seems like these problems are localized to the UK, Ireland and parts of Europe.More news: Zinedine Zidane leaves Real Madrid
This has left some customers unable to use their cards to make payments for goods and services in shops and at tills.
The problem is with Visa rather than card payments in general, so if you've got another card, you should be able to use it.
The bank HSBC said the "industry-wide issue" was affecting Visa payments, though ATM machines were still working.More news: Top Russian Official Pledges Support for Family of Slain Journalist, Arkady Babchenko
AIB said it is aware of intermittent issues with AIB cards and is working to resolve the matter.
Sandra Foy, who owns a bookshop in Manchester, northwest England, told Sky News television: "I run a small business and the loss of any business is a big deal for us".
The company replied: "Hi Sandra, we are very sorry for the inconvenience but this is a nationwide issue and is out of our control".More news: Russian foreign minister Sergey Lavrov meets Kim Jong
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