I have a shop on eBay and would like to measure how effective my Internet marketing is. Is it possible to pass parameters into eBay and then be able to use those values?
For example a link from Twitter promoting an item might be http://www.ebay.co.uk/itm/widgets/123456789012?source=twitter
I'm wondering if eBay have reserved parameters such as 'source' above that I could use.
I also send out personalised emails to clients. I'd love to be able to track the source of the sale by splicing & source=value onto a link in the email.
Using Listing Analytics might achieve the basics of what you are looking for.
To obtain a more comprehensive breakdown, I would propose replacing the default eBay links with redirects stored on your own site (for example: https://mysite.uk?action=ebay_redirect&item=123456789&source=twitter) and then utilising Google Analytics to track the parameters.
Whilst I haven't personally used it, eBay do offer an API to developers from which you may be able to glean even more information on the marketing and performance of your shop.