The Secretary shall issue licenses to dealers and exhibitors upon application therefor in such form and manner as he may prescribe and upon payment of such fee established pursuant to 2153 of this title: Provided, That no such license shall be issued until the dealer or exhibitor shall have demonstrated that his facilities comply with the standards promulgated by the Secretary pursuant to section 2143 of this title: Provided, however, That a dealer or exhibitor shall not be required to obtain a license as a dealer or exhibitor under this chapter if the size of the business is determined by the Secretary to be de minimis. The Secretary is further authorized to license, as dealers or exhibitors, persons who do not qualify as dealers or exhibitors within the meaning of this chapter upon such persons’ complying with the requirements specified above and agreeing, in writing, to comply with all the requirements of this chapter and the regulations promulgated by the Secretary hereunder.