PID is the Product ID or the style number of an item; we use the PID for Adidas sites on Yeezy releases (in the early link field).
To get it, please select "help" "get early link and keywords".
Before the release, we will send all the needed info whether they are early links, keywords or both. You can also click on the "Release Setup" button.
Keep an eye on Twitter account and the release tab inside the Bot.