Just got this today. I don't have any emails or issues with my current payment method (tapping this only brings up the one payment method I got, my Amex card, which is already registered to Apple Pay and working fine!) but I got this un-clearable notification. I tap it, it shows my current payment method which is fine, and still works (I even get the correct notifications from Wallet when I use it) so there's nothing I can do but tap 'back' and it just goes back to showing this. What's going on?
I read one thread about this, but in their case it was due to their card expiring soon, but mine doesn't expire until 2023