12. Submit the login information
order manager
7. Get food
register
5. The registration fails and the user repeats
6. Check credit documents
merchant
11. Provide notes
customer
7. Pass the inspection
5. Submit qualified orders
2. The audit is not passed
1.login，input logininformation
8. Order delivery notice
system
9. Delivery notices
2. Submit registration
9. Write data to the database
login
13. Connect to the database
Database: Users
15. The user name or password is incorrect
1. Register and enter the registration information
3. Submit payment order
3. Connect to the database
view
10. A message is displayed indicating that the registration is successful
14. Validation
8. The verification fails and the registration fails
1. Submit textbook information
deliveryman
user
10.pay
4. Repeat validation
manager
4. customer is not passed
6. Qualified
