If you want to pay by card at the supermarket checkout or petrol station, you often have to switch to cash. Due to software problems with some payment terminals, payments with giro, debit and credit cards have not been possible in many shops since Tuesday morning.

“The disruptions continue,” said a spokesman for the financial service provider Concardis on Thursday afternoon. “We continue to await signals from Verifone.”

Since Tuesday, there have been significant nationwide restrictions on the processing of transactions at H5000 card payment terminals from the manufacturer Verifone. The US company has not yet responded to inquiries. “We are trying to support the affected retailers as much as possible, for example by exchanging terminals where possible,” said the Concardis spokesman.

According to the transaction service provider Payone, the cause of the disruption is a certificate error within certain versions of the software provided by Verifone. Other devices are currently not affected, and a network disruption can also be ruled out. Merchants are advised not to unplug the terminals from power or network, or to restart them on their own.

As a result, card payment is currently not an option in some retail outlets. The discounter Aldi Nord, for example, announced on Wednesday that card payments were not possible in some branches or elsewhere in retail due to the disruption. “Our provider is still working flat out on a solution,” it said on Thursday about the current status. The drugstore chain Rossmann and Edeka also reported problems on Wednesday.

According to their own statement, Aldi Süd, Lidl and the Rewe Group, i.e. the markets of Rewe, Penny and the Toom Baumarkt, are not affected. The German Retail Association (HDE) had emphasized that companies depend on the smooth running of the payment processes. There are also problems at gas stations.

The consumer retail chain reported on Facebook: “Attention, an important note for you! Due to a Germany-wide disruption, no card payment is currently possible in our stores.” ATMs are not affected by the problem, customers can withdraw cash as usual.

According to information from the Federal Association of German Banks, there are around 970,000 cash register terminals nationwide, reported the news website “Heise online”. However, the software faults would be limited to a small proportion.

It is still unclear when the disruption can be rectified. Many supermarkets and gas stations are now putting up signs warning of the problem. For the time being, it is therefore advisable to have enough cash with you when shopping and filling up.