Apple TV+ payment
How do I pay for Apple TV+ using my Apple Account rather than my Apple credit card?
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Apple TV+ is always billed to your Apple ID payment method, which can be any valid payment method that supports automatic (pre-authorized) periodical billing, including account balance from gift card or bank transfer.
Payment methods that you can use with your Apple ID (by country) - Apple Support
Change, add, or remove Apple ID payment methods - Apple Support
Add money to your Apple Account balance - Apple Support
Check your Apple Account balance - Apple Support
If you have multiple payment methods linked to your Apple ID account, then those are tried in order: The top listed one first, then the second, etc.. You can change the order at any time, but account balance is always first.