Leave empty and everything works as a visitor. Give the cookie of YOUR Shopee account and the Full product details option also returns four facts about the seller that Shopee shows only to signed-in buyers: whether the shop is on vacation, when it was opened, its chat response rate and its Preferred+ badge (columns shopIsOnVacation, shopJoinedAt, shopResponseRatePercent, shopIsPreferredPlus). It has no effect without that option. How to copy it: log in to your Shopee site in your browser (the same site as your search, for example shopee.sg), open the developer tools (F12) › Network, click any request to that site and copy the whole Cookie request header; it must contain SPC_EC= or SPC_ST=. A cookie belongs to ONE Shopee site: start URLs from several sites are refused when a cookie is given. It is used only to read public pages at a visitor's pace, never written to the dataset or the log. If Shopee does not take it (expired, signed out), the run stops at once with a clear message. Use an account of your own: Shopee may ask it to log in again after heavy use. Not tested with a real account yet: tell us in the Issues tab if something fails.