You can not pay for any of the bundles with a gift card.
Not the Hulu/Disney or the Hulu/Disney/ESPN bundles!
They don't state this anywhere in their ads or on the gift card itself.
If you owe Hulu money and someone tries to help you out, you can't use the gift card to clear or reduce the amount owed.
Seams like they are doing anything they can to get your credit card and personal information.
Watch yourself.