GeneVincent - 8:06 am on Jan 16, 2013 (gmt 0)

To me the intent why sales don't track isn't really relevant. I just need an indication which merchant has it working well and who doesn't and get the hell away from those who don't get it right for whatever reason.

Test buys of any sort are a very good way to find out and if you don't have the time and resources to do it regzularly for all merchants, then at least place all the purchses you have to make anyway through your own links.