There are a number of reasons why your payment method doesn't work.
1. Check you have entered your credit card details correctly, including card number, expiry and CCV (3 digit code on the rear of your card).
2. Check you have sufficient funds available.
3. The card is available to use and not locked and or expired.
If you are still having problems try an alternative payment (PayPal or AfterPay) method or contact our sales team via email or phone.