Using the recurring billing - how have you implemented this exactly? With worldpay I had problems each year taking automated payments from users. Some forgot and made chargebacks, credit cards expired etc. A better way of recurring payments I thought was to send users to a page on your site where all the payment details are in hidden form tags that are then sent to the secure (worldpay) payment server.

The user has the option then of renewing or not. No automated billing as such, but they have to pay again as the scripts would be set up to suspend or delete accounts that haven't paid (after several email warnings).

Jason