Discover how payment gateways process transactions between customers and merchants, key features, and examples like Square ...

A new "merchant code" for credit cards will categorize purchases made at gun stores. But there are limitations on its usefulness — including that most guns in the U.S. aren't bought at such outlets.

Like the chips in our credit cards, the contactless card chip creates a one-time code for each transaction to accompany your payment information. This code is transmitted with your account number ...

Contactless payment options have been used in countries such as Australia and Canada for more than a decade. However, it is only within the last five years or so that credit card issuers have ...