Q: my cloud shared payment method wont update on my iphone

Hi mcurb,

I apologize, I'm a bit unclear on the exact nature of your question, and/or what you are seeing when you try to update your payment method. If you are referring to the payment information on file for use with Family Sharing, you may find the information and steps outlined in the following articles helpful:

Family purchases and payments - Apple Support

Change or remove your payment information from your iTunes Store account (Apple ID) - Apple Support

Regards,

- Brenden