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Overview
This section explains how to use the buy links that appear on the confirmation page. To help illustrate it, a random site is displayed below. I chose Petsmart. Why? I worked there as a teenager, and I have a thing for animals. But, you'll see the same layout for every major store: Staples, Office Max, Office Depot, even Amazon. They all have the same layout. At the top right of the page is a cart icon/link. Clicking that link will display the current contents of a visitor's shopping cart. This is the View Cart Link.
Each item displayed on the page contains either a link to a product description page, or an "add to cart" link. The "Buy Links" are your add to cart links. Scroll down below the image to see some sample code.
Sample Code
So what if Petsmart decided they wanted to use UltraCart as a back end? Not a bad idea. To start, they'd need to change their view cart link. Here's their current view cart link (I just did a 'view source' on their web page):
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