I decided to simplify things a bit and skip the landing page. Apparently, Envato is openly supporting this:
How to Setup Your Google Analytics profile
We highly suggest turning eCommerce settings on. This will enable eCommerce tracking
in your profile and allow you to see sales associated with your items. Your ‘sales revenue’
in Google Analytics will refer to your earnings after Envato’s commission.
So I followed these instructions to create a property in Analytics and link it to my CodeCanyon account. From what I understand I now should be seeing my sales in the Analytics dashboard. I can see that the visitor tracking is working, but I’m not seeing anything in Real-Time -> Conversions. I will have to wait until tomorrow to see if anything shows up in Conversions -> Ecommerce -> Overview. I also don’t know if I should setup Goals or not.
Then I went and created an AdWords account and a couple of campaigns. I linked the AdWords to my Analytics account. Then, from the AdWords dashboard I went to Tools -> Conversions -> Google Analytics and imported my goal from Analytics. And right now there is one Conversion Action, which says:
My ads are still pending approval, so I guess I will have to wait until tomorrow to find out if it’s working.