Cal. Bus. & Prof. Code § 25600.3
(c) For purposes of this section:
(4) “Coupon” means any method by which a consumer receives a discount on the purchase of any item that is funded, produced, sponsored, promoted, or furnished, either directly or indirectly, by a nonretail licensee, including, but not limited to, a paper coupon, a digital coupon, an instant redeemable coupon (IRC), or a mail-in rebate or mail-in discount, except as otherwise provided, or an electronic coupon commonly referred to as a scan or scanback. “Coupon” does not include:
(A)
(i) A mail-in rebate or electronic or digital rebate where all of the following apply: