100. Agent may be called upon to produce written authority

If any person makes an application to an officer to transact any business on behalf of another person or if any person represents himself to an officer as the agent of another person, such officer may require the person so applying or representing himself to produce a written authority in the form approved by the Commissioner, from the person on whose behalf such application is made or on whose behalf the person so representing himself is alleged to be acting, and in default of the production of such authority, the officer may refuse to transact such business.