For my product, we sometimes use large mailings to send to the sales page which includes a "subID" identifying which email text and list was used (there are many mutations of this subID). In the past, this subID was passed as a variable to the sales page (like http://www.salespage.com/sales.php?subid=xxxx). This subid variable would then be processed by the page and sent to the shopping cart (which, if the person made a purchase, this subID would be added to my internal database as well and linked to that person).

With Infusionsoft, I don't know how to get this subID information from the sales page, to the order form, to Infusionsoft, to my database (which I plan on using an http POST...I haven't tried it yet).

OK? any ideas? cheers...matt