City of Andover issued the following announcement on May 13
Reminder, all solicitors, peddlers and transient merchants are required to carry a permit approved by the City. Since the Stay at Home order began on March 16th the City has not issued any of these permits. If someone approaches you at your home, or if someone is selling at a location (parking lot, street corner), you can ask if they have a permit from the City. If they do not, call the non-emergency police number at 763-427-1212 to report them.
Original source can be found here.