How do I find out which credit card is attached to a subscription?

I have multiple subscriptions on my iPhone under subscriptions. I can't see what credit card is attached to each subscription. I know card listed first is the one Apple will use first, but some subscriptions I want to use the card that is listed second. By the time the card is charged on bank account it is too late. How do I manager each subscription to make sure the right card is being charged?