Ok, excellent!
So, can I just make my users use:
Buy this album:www.mystore.com/collections/country/products/johnny-cash-out-among-the-stars-cd?utm_campaign=ref1 behind every link they want to refer ?
I dont have to use all of this: ?utm_source=web&utm_medium=cpc&utm_campaign=ref1 ?
The shorter the better.
Where will I find these number in Google Analytics after it has been tracked for a while?