PayPal is a most popular online payment system that helps to easily integrate payment gateway on the website. PayPal payments standard is the most simple way to implement the payment system to your website and accept payment from the buyers. In our earlier PayPal payment gateway integration tutorial, the PHP script has been provided to add PayPal buy now button to accept payment for a single item. But many times you want to accept payment for one or more items with a single checkout flow. In this tutorial, we’ll show how you can easily integrate PayPal standard payment gateway in PHP for sending multiple items to PayPal checkout. Using PayPal Add to Cart button , you can easily accept payment for multiple items in single checkout on your website. Also, you can validate transaction using PayPal IPN and insert the order items, payment details, and transaction information into the MySQL database. Follow the step-by-step guide to integrating shopping cart with PayPal in PHP . Create Sa...