California Code, Financial Code - FIN § 22453

(a) The amount calculated by multiplying the unpaid principal balance, after an advance and including the advance, by a percent agreed upon by the borrower and the licensee, which shall be no less than 2 1/2 percent.  The minimum payment shall continue at the amount determined pursuant to this paragraph until a subsequent loan advance is made.

(b) The amount calculated by multiplying the unpaid balance at the end of each billing cycle by a percent agreed upon by the borrower and the licensee, which shall be no less than 5 percent.

(c) Any other bona fide amount agreed upon by the borrower and the licensee which would be sufficient to pay all charges and some principal, originally scheduled to be due by the borrower as of each scheduled due date.

This section does not apply to any open-end loan of a bona fide principal amount of ten thousand dollars ($10,000) or more as determined in accordance with Section 22467.