The most common reasons for this situation are incorrect credit or debit card details, insufficient funds or exceeded transaction limit. In some cases this is due to the card issuer blocking the transaction for fraud protection purposes.
If you have received a failed transaction notification, please try placing your order again. If the transaction is still unsuccessful, please contact the card issuer (the number is usually on the back of your credit or debit card) and ask them to permit an authorization from Chaos /Verifone (our payment processing partner).
Alternatively, you can try a different credit or debit card or contact our support team for assistance.