California Code, Vehicle Code - VEH § 17454

Service of process shall be made by leaving one copy of the summons and complaint in the hands of the director or in his office at Sacramento or by mailing either by certified or registered mail, addressee only, return receipt requested, the copy of the summons and complaint to the office of the director in Sacramento. Service shall be effective as of the day the return receipt is received from the director's office. A fee of two dollars ($2) for each nonresident to be served shall be paid to the director at the time of service of the copy of the summons and complaint and such service shall be a sufficient service on the nonresident subject to compliance with Section 17455.