There is nothing to hack in Apple Pay. Apple Pay does not store your credit card information anywhere. Even if were hacked, there's no way to access any card information.
Your device holds an encrypted package with a device account number that is sent to your bank when you use Apple Pay at a store or website, and they are the ones that can decrypt that package and link the device account number to your credit or debit card to process the charge.
If you have a charge on your card, it was not because Apple Pay was hacked.
Why do you assume it even had anything to do with Apple Pay?
If you see "apple.com/bill" on your statement, that has nothing to do with Apple Pay, that is a made through the iTunes platform on your card if it is added to your Apple ID. Charges like a app or service subscriptions or the purchase of a move or app from Apple's stores. Apple Pay is not involved in any way in those charges.
What exactly are you seeing that makes you think Apple Pay has anything to do with it?