Why can’t I change my subscriptions default payment ?

Did all that... still to no avail.

I decided to go a different route. I have set up monthly reload to cover my subscription costs... adding a little extra to build my 'savings plan' to purchase my Apple Watch in a few months.

Thank you for your time.

the link tells me it uses a hierarchy to pay for purchases starting with Apple Card/Pay. How can I remove AppleCard from the hierarchy without losing my balance or how can I transfer the balance to an account to pay for a device at a later date?

I’ve tried to change order of my payment cards. I can add, remove and change order of my credit cards, but the Apple Card is ‘stuck’ at the top of the list.

I've tried that and it doesn't work... Apple and is still stuck at the top of my payment list.

No restrictions or parental controls as far as I can tell.