When a transaction is not permitted to a card holder it means that the credit card or debit card has been flagged as restricted or blocked.
In some cases it may have not been blocked or restricted but can sometimes just be an error on the payment processors side.
I've had the transaction not permitted error before online before and tried it again using a different payment processor and it went through.
if your credit card or debit card gives you the transaction not permitted message then you should try another payment processor or option if possible and if it still does not work you should contact the card issuing company to fix the issue.
It could've been blocked or restricted and they can unblock or remove the restriction from the card to allow it to go through.
The message Transaction Not Allowed indicates a rejection on the side of the credit card provider for unspecified reasons.
It doesn't necessarily mean that there is an issue with the card, but it does indicate that the bank will not approve this transaction.
You will need to contact your bank for more information.