The department is an agent of each person, including the self-employed, who employs one or more transient sellers of consumer merchandise for service of any process, notice or demand required or permitted by law to be served, and this service is binding upon the person. Service of any such process, notice or demand must be made as provided by Rule 4(d)(b) of the Maine Rules of Civil Procedure, as amended. [2001, c. 324, §12 (NEW).]