Javascript And Webshop Tracking/affiliate Across Websites, How To Do?

I have a small front end to a webshop. All customers that go through my website and buy an item from the webshop I get back 5% of the amount. I need to find a way af tracking the c

Solution 1:

The cookie approach is not very good, since most browsers block 3rd party cookies. Instead i solved it by logging IP when they visit my page, and the log it again when the script calls be back. Works fine.