Clause 18

The agent, clerk or servant of any renter or registered renter may transact business generally at any customs office on behalf of such renter or registered renter:Provided that a senior officer of customs may refuse to transact business with such agent, clerk or servant unless such renter or registered renter identifies such agent, clerk or servant as empowered to transact such business and deposits with such officer a signed authority authorising such agent, clerk or servant to transact such business on behalf of such renter or registered renter.