Answer:
Credits cards defer payments.
Step-by-step explanation:
When you defer something, you put it off. When you use a credit card you are putting off paying for an item while promising you will pay it back at a later time. It isn't a store of value because there is no value in the card. It is has not led to a wider use of currency because when you swipe the card, there is usually no currency available for you to use at the moment. They are not part of the money supply because credit cards have no monetary value. Hope that helps!