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Note: I use "Miva Merchant" shopping cart
We then record the details onto a cookie which we read back when the visitor reaches an action page on site, eg a thanks for buying or signup page.
Add in the sales value and do a little juggling with the numbers and you get a cost per sale for individual keywords across different engines. This gives us accurate figures for maximum bid values, which are the keywords with the best returns and comparative figures for different PPC engines.
Hope this helps.