The most common decline reason is the ZIP/postal code not matching the details your card issuer has on file.

Make sure the billing address details entered at checkout match those your card issuer has on file, otherwise your card issuer may decline the transaction.

You may need to authorize the transaction with your card issuer, known as 3-D Secure, via an app or an SMS text from your card issuer to confirm the transaction.

If your card is declined at checkout, you may see a temporary 'pre-authorization' charge on your card statement, this will automatically be removed by your card issuer, usually within 24-48 hours as no successful charge was made.