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 ...

A credit card security code provides protection against fraud in online and over-the-phone transactions.

Merchants typically use ZIP Codes to determine where their customers live and for other marketing purposes. But beyond that, the information could lead to credit card fraud and identity theft ...

Closely guard your credit card security code unless you are certain that a legitimate business needs it – and only if you initiate a transaction.

A 2011 analysis for the California Judiciary Committee explained that credit card companies provided financial incentives to use ZIP code verification at the pump.