Please refer to the following information:
1) Check the card details to confirm the information is accurate. e.g : the expiry date or your billing address. (Common problems including incorrectly spelled name)
2) Make sure you enter the security code correctly (3 digit numbers on the back of card).
3) Your card issuing bank may have declined your payment. Please contact card issuing bank. If the above information is correct but still does not work, you may try to pay it with another payment method or using PayPal for more convenient method.