Add a payment method that you and your family can use for the App Store, iCloud+, Apple Music, and more. If you can't add a payment method, learn what to do.| Apple Support
Payment information that you use for Apple media purchases and subscriptions might be automatically updated by your financial institution. Learn how to edit your payment method manually.| Apple Support
If an Apple Account is only used for making purchases, those purchases can be migrated to a primary Apple Account to consolidate them.| Apple Support