It shall be unlawful for any seller to induce or attempt to induce any person to enter into a contract subject to this act by offering a rebate, discount, commission, or other consideration, contingent upon the happening of a future event, on the condition that the buyer either sells, or gives information or assistance for the purpose of leading to a sale by the seller of, the same or related goods.
Source:
Section 1803.10, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=1803.10..