Current accepted payment methods are shown at checkout, which is always the authoritative list. Payment is taken through a secure hosted payment page, so card details are entered on the payment processor's page rather than being handled by this site.
Payment options can change, and a list typed into a help page has a habit of going stale. The checkout page shows what is accepted at the moment you order, so that is the list to read.
If a method you expect is missing, get in touch and ask rather than assuming it is permanent.
Card entry happens on a hosted payment page operated by the payment processor. That means the card number is never entered into or stored by this website.
Our privacy policy sets out what data we do hold and why.
If a payment fails at checkout, the usual causes are an address mismatch with the card billing address or a bank declining an unfamiliar merchant. Both are resolved with your bank rather than with us.
If an order shows as paid but you have no confirmation, contact us with the order details before re-ordering.