how do I change appletv+ payment card
Change Apple tv+ payment card.
FireTVCube(Gen2),
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See: Change, add, or remove Apple ID payment methods - Apple Support
Note that you currently can’t make any in-app transactions in the Apple TV app on Fire TV, as that isn’t supported for that device. Instead you will have to subscribe/buy/rent on a different device. Once the transaction is done, you can then view the content on Fire TV, when signed in with the same Apple ID account.