Update - We have identified an intermediate workaround while Recurly and our card processor are still analysing the root cause. Customers who have valid cards rejected should contact support@kraken.io for a resolution.
Oct 26, 20:48 CEST

Identified - We can reproduce the issue and have traced it to the payment gateway service. We are working with their support to locate the root cause.
Oct 26, 19:00 CEST

Investigating - Some customers have reported that perfectly valid credit cards are being rejected. This matter has been escalated to our payment billing provider, @recurly, who admit that the problem is on their end and are working on a solution.
Oct 25, 13:46 CEST