how do i update my credit card for my HULU subscription?

This document explains how to 'Change, add, [review,] or remove Apple ID payment methods' on a Mac or Apple mobile devices; click here --> https://support.apple.com/HT201266

Change your Apple ID payment method if you don't have an Apple device --> https://support.apple.com/HT210755 - PC, MS Surface, Android, Chromebook, online at tv.apple.com

'If you can't remove your last payment method or use no payment method with your Apple ID' click here --> https://support.apple.com/HT203905

- If you are updating an old card and have ongoing subscriptions you may need to first add the new card and make it the primary payment method before deleting the old card.

If you still have problems, click here --> https://support.apple.com/choose-country-region/media-services Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world." - https://support.apple.com/HT201232

Did you subscribe through Apple, Disney+, ESPN+, or Hulu? Each has its own area for updating credit cards.

For Apple, you simply need to make sure your payment method on file for all other purchases is up to date. You can do this on your iPhone or iPad by going to Settings > Your name at the top > Media & Purchases > View Account > Manage Payments.

For the other methods, you will need to contact their support for the payment method locations on their websites.