How to add a new credit card to my Apple TV account?
How-where do I add a new credit card to my Apple TV account?
[Re-Titled by Moderator]
Chromecast,
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Apple TV is not an account. You can link your Apple TV to an Apple Account, but you do not enter your payment method into your Apple TV app or hardware. You enter payment methods into your Apple Account. Please review the information and follow the steps in the Apple Support article I linked below.
Add a payment method to your Apple Account - Apple Support