It would be nice to be able to see which account is linked to which card directly via the apple widget. I have Siri shortcuts in place that automatically link my debit card to any account I choose, but there's no easy way to verify if it was successful other than opening the bunq app. Here's a lazy mock-up of what I mean (see blue icon next to my 'groceries' account):
The icon color could be based on the accent color assigned to each card (as visible in Apple Pay).