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Go to Account › Billing and add a new card; it becomes the default for future renewals. A failed renewal is retried three times over a week before the plan pauses.

'Card declined' comes from your bank, not from us; try another card or contact them. '3D Secure failed' means the verification pop-up was closed; retry and complete it. If you were charged but see no order, the charge is a pending authorisation and drops off within 5 business days: email us the last four digits and the date and we'll confirm.

If checkout returns an error after payment, don't retry immediately. Check Account → Downloads first; most 'errors' are already-complete orders. If nothing's there after 10 minutes, contact support with the order email.

Every payment emails a PDF invoice automatically. You can also download any invoice from Settings → Billing. Add a VAT number there to have it printed on future invoices.

Settings → Billing → Payment method. The new card is used from the next renewal.

If a seller doesn't resolve a problem within five days, open a dispute from the order page. A support agent mediates, reviews both sides, and decides within seven days; refunds issued through a dispute go back to the original payment method.