Essentially your credit card number is like a transaction token now. If the token is compromised, no big deal the transaction is over and that token is no longe

Essentially your credit card number is like a transaction token now. If the token is compromised, no big deal the transaction is over and that token is no longer valid. But it has some backwards compatibility built in so you can re-use the token for systems that are setup to charge one number / token every month. Your credit card number is essentially an implementation detail of your card. Very cool.