Apple pay charges more

If you purchased $1 worth, it is very predictable that you will ultimately be charged $1 on your Bank Card. There are times where temporarily the amount shown on your ApplePay within the PassBook App will show temporary 'Reserve' charges that will disappear when the transaction is finalized. If that is what you are seeing, it has nothing to do with ApplePay, but rather the processes and practices of Your Bank. Without seeing the Vending Machine however I have no idea if they have a note regarding some uncharge for Credit or Debit sales.

There should be a sticker on the vending machine that says something like the price shown is the cash price. The extra amount is to cover the credit card transaction fee.

I've used Apple Pay at several vending machines and all have had the notice. Those that I've used only charged ten cents more for using a credit card.

Apple does not charge your credit card, and they do not determine the amount to charge your card. That is determined by the vendor you are making your purchase from and your financial institution.