If the payment fails to process successfully, please note the message displayed. If you don't have sufficient funds available on the selected payment method, either top up that payment method or select a different payment method. Otherwise report the problem to the support team. If possible, capture a screenshot and keep it in case our support team ask for it.

Please note that American Express have restricted payments to HMRC, so any payments to HMRC with an Amex card will automatically decline. HMRC can be paid with other payment methods such as Visa and Master without restriction.
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