Why has my debit / credit card been declined?

There are several reasons why your card may have been declined. Some reasons are listed here:

The card issuer has declined the transaction for security reasons or exceeding limits in which case, you should contact your card issuer / bank
You have entered the incorrect card details
You have an insufficient balance to carry out the transaction
The personal details does not match the personal details on your Luxon account
You are trying to register more than the maximum number of registered cards (3)