Hi Bill. When you say "affiliate parameters are already saved by Shopify and are part of the order", are you talking about the landing_site_ref feature where you do something ?ref=... ? If not could you give an example of an affiliate parameter that is available as part of the order.
I understand lots of affiliate systems use heavily encoded link tagging and 3rd party cookies. My system tries to use only first party cookies to ensure this will work on mobiles and tablets where the majority of iOS6 users now block 3rd party cookies by default.
I thought CORS might come in handy and the Thank You page is on https://checkout.shopify.com but my shop's 1st party cookie is sitting on myshop.com
If you can explain how I can pass affiliate parameters into my order without using the landing_site_ref feature, that would be awesome.