[Update] After receiving an official statement from Worldline, it is confirmed that all issues have been solved.
Payment transactions of any kind are authorized again. Please accept our sincere apologies for any inconvenience this may have caused. Your understanding and patience during this matter were highly appreciated.
Official statement from Worldline: Dutch - French
As a result of a planned intervention at the payment network of Worldline in the night of Sunday April 15th to Monday April 16th, our payment services are currently experiencing technical issues.
This means that your payment card might be refused when used for cash withdrawals, purchases, e-commerce, etc.
Our hotlines are currently overloaded due to this matter, our sincere apologies for the inconvenience. We are working with high pressure to find a solution as soon as possible and will keep you updated.