California Code, Corporations Code - CORP § 31011

(a) The purchase or agreement to purchase goods at a bona fide wholesale price if no obligation is imposed upon the purchaser to purchase or pay for a quantity of the goods in excess of that which a reasonable businessperson normally would purchase by way of a starting inventory or supply or to maintain a going inventory or supply.

(b) The payment of a reasonable service charge to the issuer of a credit card by an establishment accepting or honoring that credit card.

(c) Amounts paid to a trading stamp company under Chapter 3 (commencing with Section 17750) of Part 3 of Division 7 of the Business and Professions Code by a person issuing trading stamps in connection with the retail sale of merchandise or service.