I want to let my clients earn some commission if someone clicks through from their website to mine AND later converts into a new customer. I don't seem to find any WordPress affiliate plugins that do this nicely.
The idea is to have an ID attached to the end of my link on their site. I can capture that ID on the landing page, but the problem is to carry that ID through as they click around my site (sessions? in the URL?), and then if they fill in the contact form, to add it as a hidden field.
I will then have that ID in the enquiry email I receive and if that person becomes a new customer I can easily see who the referring client was.
Whats the best way to do this?