Roblox update
My daughter has ipad but roblox needs update and i dont want to use bank card so i put in prepaid cards and still not updating
Down at the bottom of the linked page are links to kinds of payment methods that may not be accepted.
Add a payment method to your Apple ID - Apple Support
If debit cards are not accepted you could alway try to buy an iTunes gift card and redeem that then use that to purchase the update.