ALBUQUERQUE, N.M. (WHAT THE TECH?) — You probably have at least one simple four-digit code memorized. We use them for a lot of important things like debit cards and phones. But some pin-codes are more ...

For some credit card purchases in Canada, a postal code is required as a security measure. If using a credit card in the U.S., you may need to use a ZIP code instead. Many or all of the products on ...