DeveloperTutorials.com has a new tutorial posted today about making the connection between a PHP/MySQL application and PayPal through the GoLive interface (don't worry - the source code's there too).
This tutorial is meant to show how GoLive users can integrate their PHP/MySql dynamic data with PayPal to create a simple online store with some advanced pricing features. This tutorial assumes that you are already familiar with using dynamic content in GoLive and aren't too terrified of working with source code.
They start with the SQL to hold the item information (including price) and show briefly how to set it up with the Inspector helper in GoLive. They show how to grab the HTML off of the PaylPal site to link to the object and how to make this add it to the shopping cart on the PayPal website. To finish it off and make it look a little nicer, they also show how to add images to the layout for each of the items.