Site was working normal, however when people go to pay via credit or debit card it comes up with this error.
I logged into the cardinal centre (https://paypal.cardinalcommerce.com/) with the existing 3D secure details. It said my password had expired. So I changed it. Added it to Cubecart and it still says the same error.
Has Paypal changed something that could break Cubecart? if so is there a patch to fix it?
Just to add, the site had worked since cubecart 5 and had been taking 3D secure payments since yesterday.