This incident has been resolved.

We are continuing to work on a fix for this issue.

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.

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.

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.