The WordPress Simple Paypal Shopping Cart plugin by Tips & Tricks HQ allows customers to buy products via a WordPress blog/site with just a few clicks. On a basic level, it is an interface for including PayPal’s “Add to Cart” buttons into posts or pages (using shortcodes) that are about specific products.
The product details are tied into each button. It uses the a streamlined checkout process through the PayPal web site. There is no need to store customers personal and financial information freeing the shop owner from having to put in place the necessary security and privacy information. Naturally, PayPal profile based shipping is supported.