That epik parameter has existed for some time. I can see it on my most recent pin (July 2024) and a random older one (Dec 2022). I remember trying to figure out what Pinterest uses it for before and it's a tracking code Pinterest adds for their own use:::
The 'epik' query string helps in tracking user sessions and interactions with pinned content. It aids Pinterest in monitoring user engagement, understanding content virality, and providing insights into user behavior on the platform.
My layman's understanding - which could be wrong - is that that parameter means nothing to Zazzle, it's something set by Pinterest that only their own internal analytics will understand. Facebook does similar with adding a 'fbclid' parameter. I don't see how either would effect Zazzle referrals. If you are sharing a URL that includes your RF ID, you can still see it in the URL before the parameters Pinterest/FB add so Zazzle can still "see" it and use it. If you're sharing a "clean' link as a Promoter, same thing - I think those parameters Pinterest/FB add would just be gibberish to Zazzle, it's not going to effect them "seeing" whether you included your RF ID or not in the link.
