Before you learn how to add a payment gateway to a website in great detail, it’s important to understand what it actually is.
A payment gateway processes credit cards at online and offline stores. It transfers the key information between websites/mobile devices and payment processors/banks, and vice versa.
So if you decide to integrate payment into a website and make the user experience smooth, think of the gateway as a tool to deal with all the financial transactions online.
Basically, it’s an online representation of a real point of sale terminal that you see in retail stores. To ensure the transaction safety and protect your website from fraud, a payment gateway encrypts all sensitive information: credit card number, expiration date, and CVV code.