Some of Ireland's biggest stores were without card machines on Monday after nationwide technical issues.
Supervalu and Centra both informed customers that due to a problem with their provider, they would be accepting cash only payment for a time.
Other big supermarkets like Tesco and Dunnes however were unaffected by the outage.
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Stores that were hit by the outage are expected to have them back in working order today.
In a statement on Twitter, Supervalu Ireland said: "Our card payment service provider is currently experiencing technical issues which is affecting the processing of card payments at SuperValu stores as well as online.
"Our provider is working to rectify the issue and to ensure the affected card payment systems will be back working as soon as possible. Customers can pay in cash in stores, as normal, and we apologise to them for any inconvenience caused."
Centra Ireland tweeted: "Our card payment service provider is currently experiencing technical issues which is affecting the processing of card payments at Centra stores as well as online.
"Our provider is working to rectify the issue and to ensure the affected card payment systems will be back working as soon as possible. Customers can pay in cash in stores, as normal, and we apologise to them for any inconvenience caused."
While another Dublin bookstore said, they had the same problem.
Gutter bookshop said in a tweet: "Anyone else's card machines down?
"Neither of ours connecting to merchant services and declining all sales."
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