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 ...

Why should I consider using my credit card less? In short, to avoid overspending. When you use a debit card you're using money that you already have -- you are living within your means.

Your debit card is a direct line to the bank accounts you have it linked to, and it doesn't come with the same level of robust protection as credit cards do.