This is a second post on the blog
March 5 2008 by Justin Cutroni
This is part 2 in my series on Google Analytics e-commerce tracking. In part 1 I described, at a conceptual level, how GA e-commerce tracking works. In this post I’ll get into the specifics of the code and how to install it.
This isn’t the most exciting stuff (that will be part 3), but a correct setup leads to correct data. 
Step 1: Activate the Reports
The first step in setting up GA e-commerce tracking is enabling the e-commerce reports. Log into GA and edit the profile settings. Specify that your site is an e-commerce site. This activates the e-commerce reports.
There are other e-commerce settings that don’t get much use (unless you’re an international site). You can specify one of 25 different currencies (wow!) and the number of decimal places you would like displayed (1,2 or 3). Even if you use USD you can specify 3 decimal places. Go ahead and try it, it’s interesting.
Remember, e-commerce reports is a profile setting that is “off” by default. You’ll need to activate the reports for each new profile you create.
Step 2: Tag your Receipt Page
I know this seems like a silly step, but make sure you add the GA tracking code you your receipt page. You must have the standard GA tracking code on your receipt page in order to track transactions. The reason is that the e-commerce tracking code is stored in the ga.js. If this file is not included on the receipt page then you can’t track transactions.
Step 3: Install the Code
This is the hard part: code construction. As we learned in part 1, GA uses a JavaScript collection technique to track e-commerce transactions. Your server code must inject transaction information into the GA JavaScript before sending the receipt page back to the browser. When the receipt page renders in the visitor’s browser the JavaScipt executes and sends the transaction info to GA.
