If your previous payment was done by Visa or Mastercard and was not done using the 3-D Password security, then they will ask for your credit card at check in. You could conveniently "forget" to bring that card and then they will ask for a new card to charge and refund your old payment.

However, you won't get any of the online booking bonus points for this.

If your previous payment was Verified by Visa or Mastercard Securecode verified, then I don't know how you might do this.