how payment gateway works and how to implement it in php

Question

I am first time working with payment gateway and dont know how to use and integrate it in php

Answer 1

An online payment gateway is the interface between your Web site and your merchant account.
The online payment gateway allows you to immediately verify credit card transactions and authorize funds on a customer's credit card directly from your Web site.
It then passes the transaction off to your merchant bank for processing, commonly referred to as transaction batching