Monthly invoice PDF downloads have been working again since the fix. This incident is resolved.

The fix is deployed and PDF downloads work again. We are monitoring the situation.

Cause found: the payment provider rejected the PDF request because our API did not authenticate it correctly. A fix is in progress. Invoices and payments themselves are not affected.

Downloading monthly invoices as PDF in the reseller portal returns an error. We are investigating the cause. The portal itself remains available.