Any affiliate program must be described prominently in the product's Chrome Web Store page, user interface, and before installation.
Related user action is required before the inclusion of each affiliate code, link, or cookie. Some example violations include:
An extension that updates a shopping-related cookie without the user's knowledge while the user is browsing shopping sites.
An extension that appends an affiliate code to the URL or replaces an existing affiliate code in the URL without the user's explicit knowledge or related user action.
An extension that applies or replaces affiliate promo codes without the user's explicit knowledge or related user action.