What is a Shopify Collective referral page and how do I add one to my store?

A referral page is an automatically generated, branded page you can add to your storefront to help interested retailers learn about Shopify Collective and install the app to connect with you. You can't customize its content, but you can activate it and add it to your store's menu from Collective: Supplier Settings by copying its URL into a new menu item under Content > Menus. It can be removed the same way if you no longer want to display it.