A process and service that automates payment transactions between the shopper and merchant. Classically refers to credit card transactions, but nowadays the term describes also internet payment methods like Paypal.

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Credit card fraud is not new to the Magento eCommerce platform.There are two methods used by attackers to siphon credit cards away from eCommerce stores. The first of which is through the use of Javascript which takes place client-side. This is achieved through malicious JavaScript hosted on the web page which causes the customer’s machine to silently send a crafted request to a server in control of the hacker. The other method commonly used by attackers, as described in the Sucuri blog, is modification of the app/code/core/Mage/Payment/Model/Method/Cc.php file. This method requires shell access to the server and indicates a serious compromise.