Your billing zip code, or credit card postal code, is the five-digit number on the bottom right, which in this sample is 90210. This would be the zip code associated with your billing address. It ...

“What ZIP Code do you use for a Visa gift card?” “I’ve tried this numerous times and it says my zipcode is wrong,” another echoed.

Why do merchants sometimes ask us for our ZIP code when we buy something? I recently visited the Mob Museum in Las Vegas, an interesting addition to Sin City’s attractions. I paid my admission with a ...