"Visa is now experiencing a service disruption", it read.
The company said it was investigating the cause of the disruption in a statement. Our goal is to ensure all Visa cards work reliably 24 hours a day, 365 days a year.
Customers around Europe vented their frustrations on social media, with some unable to pay bills or order taxis overseas.
The problems are understood to have begun around 2.30pm on Friday 1 June 2018.
Paymentsense said they were in touch with Visa and have apologised to customers "for any inconvenience".
The Visa payment system has crashed across Britain.
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"We are now experiencing a very high volume of calls coming into our Customer Service teams and would ask for your patience in regards to this issue. It is affecting all payment providers across the United Kingdom and Ireland". We'd encourage affected customers to try contactless transactions where possible.
Payment processing company Paymentsense says transactions are starting to go through after a period of disruption but "there is still some intermittency".
Top pic: Cash, you don't get these problems with that!
Huge queues formed beside many ATMs as customers attempted to withdraw cash.
They'll be aware that there's a problem with Visa cards by now - and they can't do anything to fix it.