This seems to be a Pinterest problem as I understand, can't help on this one. Although, if you mean the browser's address bar URL on Zazzle, you don't see your referral ID in your browser's address bar, it gets automatically redirected/removed. This doesn't mean, your referral has not worked, it's just the URL that gets cleaned up.
One important tip when you promote both your own and others' products: To get your promoter share you have to use "clean" links without your affiliate ID attached, and you have to link solely to your own store, categories, collections, or single products. If you link to a different Zazzle page, you'll trigger Zazzle's own "referral" cookie (if there isn't already a different one active). The cookies last one week and can't be overwritten during that period. This gives some extra safety for the one coming first but has also drawbacks when you want to promote both. Try to keep your targeted audience separated. Use only your clean promoter link on sites/socials where you want to promote SOLELY your own products, and use your referral ID on different places to promote all sorts of products. If you mix your audience/links, you may end up getting nothing at all, if your promo cookie sticks and the customer buys something from a different designer.
