Users: WharfsMain functions: Query shipping bill declaration data through ship name, voyage number, bill of lading number, container number, place of departure and destination, date of declaration and other conditions. Clearance of wharf means that the wharf has collected fees. Clearance can only be conducted once.Buttons: Clearance, Query, Clear and CancelThe auxiliary system shall be connected to the wharf system, and the wharf shall send information about related expenses to the system by bill number. The system design shall reserve billing and payment interfaces, and later relevant expenses can be paid to the wharf through the platform in advance