Each solicitor or peddler shall keep such license in possession at all times while doing business in the City and shall, upon request, exhibit the license as evidence of compliance with all requirements of this chapter or leave a copy of the license with the prospective customer. Each transient merchant shall display publicly such merchant’s license in the merchant’s place of business. Any misrepresentation in the displaying of licenses issued under this chapter shall subject the licensee to revocation in addition to any claim in state or federal court by an injured purchaser.