Hi,
Thanks for letting us know about the issue that you are experiencing.
Please be aware that pre-paid gift cards can be used as a payment method as long as the card brand is an accepted card type, for example MasterCard or Visa.
For more information regarding Roku Pay, visit out Support page here: What is Roku® Pay?
For information on how to update your payment method on your Roku account, visit our Support page here: How do I update or remove the payment method for my Roku account?
Thanks,
Danny
Danny R.
Roku Forum Moderator