California Code, Business and Professions Code - BPC § 22355

(a) The county clerk shall maintain a register of process servers and assign a number and issue an identification card to each process server. The county clerk shall issue a temporary identification card, for no additional fee, to applicants who are required to submit Request for Live Scan forms for background checks to the Federal Bureau of Investigation and the Department of Justice. This card shall be valid for 120 days. If clearance is received from the Federal Bureau of Investigation and the Department of Justice within 120 days, the county clerk shall immediately issue a permanent identification card to the applicant. Upon request of the applicant, the permanent identification card shall be mailed to the applicant at his or her address of record. Upon renewal of a certificate of registration, the same number shall be assigned, provided that the applicant is renewing registration in the same county in which he or she was previously registered and there is no lapse of three or more years in the period of registration.

(b) The temporary and permanent identification cards shall be not less than 3 1/4 inches by 2 inches and shall contain at the top the title, “Registered Process Server,” followed by the registrant's name, address, registration number, date of expiration, and county of registration. In the case of a natural person, it shall also contain a photograph of the registrant in the lower left corner. The identification card for a partnership or corporation registration shall be issued in the name of the partnership or corporation, and shall not contain a photograph.