You can set up a credit card direct debit when paying your outstanding invoices, i.e. when placing your first order or when renewing your world4you services.
To do this, go to Your account > Invoices > Open invoices in the customer area and select By recurring payment.
Please note:Unfortunately, it is not possible to change the payment details without an open invoice.If your credit card has expired, you can stop the recurring payment/debit and enter your new credit card details again for an open invoice amount.