Cal. Public Resources Code - PRC § 42984.27. Section 42984.27.
An online marketplace shall annually do the following in accordance with regulations adopted by the department pursuant to Section 42984.2:
(a)
(1)
Notify the department and the PRO of all third-party sellers with sales of covered products over one million dollars ($1,000,000) sold on their online marketplace in the preceding year and provide all required information. If a third-party seller does not have any sales in California during the preceding year then the online marketplace shall not provide their information to the department.
(2)
The amount of sales described in paragraph (1) includes only those transactions through the online marketplace for which payment is
processed by the online marketplace directly or through its payment processor.
(b)
Provide all third-party sellers described in (a) with the information on requirements of law as provided by the PRO pursuant to paragraph (8) of subdivision (g) of Section 42984.10.