An authorisation error could mean several things. First, please be sure that all billing information is correct. You may want to make sure that the postcode you entered matches the postcode on file for your billing address. Second, be sure to check the expiration date and card verification numbers on your card. Also, please be aware that we only accept American Express, MasterCard and Visa for credit card payment. If you are still receiving an error message and you feel that all of the information you are entering is correct, you may wish to contact your bank for further details. If you are using a debit card, it's possible you may need to adjust your credit limit for larger purchases. At any point though you may contact us on 0508 200 300 between Monday and Friday 9am - 5pm for further assistance.