What will really be hilarious is if the station owner can have the cards that were used to make those purchases at the wrong price charge an adjustment to correct the error. Since each transaction had to record the number of gallons purchased and the price per gallon charged, it would probably be fairly easy to facilitate the adjustment. Furthermore, it would be perfectly legal to do so since the correct price was posted on the signs at the station.
The station owner will not likely have any access to credit card numbers from the transaction. If he has anything, it’ll be hashed numbers (a string of x’es with only the last 3 or 4 digits.
It’s a common security precaution that protects both the customer and the merchant.
There is absolutely no way for any adjustment on the credit card transaction. Each sale or refund is unique. There is an authorization code that appears on each CC transaction...it is the validation electonically of that singular action. All account info is x’d out (save for the last four digits of the CC account...there is no revisiting the transaction.