You can have a maximum of three active payment methods on your account at any one time.
If you already have three active payment methods on your account and you'd like to register a new one, contact our Customer Services team via the 24/7 Live Chat and they will be able to help you update your payment details. If you are having issues registering a new payment method and have less than three active ones, get in touch with us and we'll check to see what the problem is.