I got charge $5.99 on my Apple Pay and there’s no reason why

GO to this link - If you see 'apple.com/bill' or an unfamiliar charge on your statement

If you see a transaction you do not recognize or have an issue with a transaction open Wallet>tap on the card used>tap on the transaction (photo 1)>tap on the amount (photo 2)>look for a report an issue link. (photo 3)

photo 1 - select the transaction

photo 2 - click the amount

photo 3 - click the link