California Code, Civil Code - CIV § 1748.21

(a) “Charge card” means any card, plate, or other credit device pursuant to which the charge card issuer extends credit to the charge cardholder, primarily for personal, family, or household purposes where (1) the credit extended does not subject the charge cardholder to a finance charge and (2) the charge cardholder cannot automatically access credit that is repayable in installments.

(b) “Charge cardholder” means the person to whom a charge card is issued.

(c) “Charge card issuer” means any person that issues a charge card or that person's agent with respect to the card.