California Code, Financial Code - FIN § 23036

(a) A fee for a deferred deposit transaction shall not exceed 15 percent of the face amount of the check.

(b) A licensee may allow an extension of time, or a payment plan, for repayment of an existing deferred deposit transaction but may not charge any additional fee or charge of any kind in conjunction with the extension or payment plan.  A licensee that complies with the provisions of this subdivision shall not be deemed to be in violation of subdivision (g) of Section 23037.

(c) A licensee shall not enter into an agreement for a deferred deposit transaction with a customer during the period of time that an earlier written agreement for a deferred deposit transaction for the same customer is in effect.

(d) A licensee who enters into a deferred deposit transaction agreement, or any assignee of that licensee, shall not be entitled to recover damages for that transaction in any action brought pursuant to, or governed by, Section 1719 of the Civil Code.

(e) A fee not to exceed fifteen dollars ($15) may be charged for the return of a dishonored check by a depositary institution in a deferred deposit transaction.  A single fee charged pursuant to this subdivision is the exclusive charge for a dishonored check.  No fee may be added for late payment.

(f) No amount in excess of the amounts authorized by this section shall be directly or indirectly charged by a licensee pursuant to a deferred deposit transaction.

(g) A licensee shall be subject to the provisions of Title 1.6C (commencing with Section 1788) of Part 4 of Division 3 of the Civil Code.