Google Analytics - Training.PDF

Google Analytics can track data from a shopping cart on your own or other,
domains with the addition of some code.
If your website initiates a purchase checkout process on a separate store site
(for example, if you send customers from www.mystore.com to
www.securecart.com), you just have to add some tracking code to your store
site and the shopping cart pages on the host site.
The specific code can be found in the Analytics Help Center in the article titled,
“How do I use Google Analytics to track a 3rd-party shopping cart?”

Read more here:

http://static.googleusercontent.com/media/www.google.com/en//grants/education/Google_Analytics_Training.pdf