Can’t update apps
whenever I go to update an app it says there is a billing problem, I do not have a card number to put in and have no idea how to fix this
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I do not have a card number to put in
See this Apple article: What type of gift card do I have?
What type of gift card do I have? – Apple Support (UK)
👉 What you can buy with these gift cards.
When you redeem an Apple Gift Card or App Store & iTunes gift card, you can make purchases with your Apple ID balance. Those purchases can include apps, games, subscriptions such as Apple Music or iCloud+, and more. But for some purchases, Apple ID balance can't be used. Find out what you can buy with your Apple ID balance.
Where the Apple Gift Card is available, you can also use your Apple ID balance to buy products and accessories at apple.com or in the Apple Store app. See if Apple Gift Card is available in your country or region.
See also the following Apple articles:
Payment methods you can use with your Apple ID
Payment methods you can use with your Apple ID – Apple Support (UK)
Add money to your Apple ID balance
Add money to your Apple ID balance – Apple Support (UK)