Apple Pay Card issue

How do I fix an issue with a card that was declined yet has subscriptions attached to it? Cut a long story short..it had a brief moment of not having funds in it, but now fine. I now can’t remove the card (because of subscriptions - which I can’t see for some reason under ‘subscriptions’) and I can’t use it for my payment method for my apple account?

Can I re-add the same card again even though it’s not removed?

any ideas?

cheers