In item B, the corporate client shall sign and affix the official seal on the futures brokerage contract by the legal representative or authorized person. Item D, the futures company applies for trading codes of various futures exchanges for customers through the monitoring center. After receiving the application materials of customer transaction codes forwarded by the monitoring center, the futures exchange distributes, allocates and manages the customer transaction codes according to the business rules of the futures exchange, and feeds back the processing results of various applications to the futures company through the monitoring center.