Are you Canadian Travelling to USA?
Paying at the Pump with Canadian Card can be tricky. Because they may prompt you for a 5-digit zip code of your billing address. Canadian Postal codes are very different from US zip codes. So the trick here is, Simply use the three numbers from your postal code and add two zeros. If your postal code is L1M 2N3 the 5-digit number you enter is: 12300.
Good Luck !