Design a UML diagram for a$)$Process Model, b$)$Sequence diagram, c$)$Class Diagrams: A plates app. mobile and web application system to manage the users to buy packages $($including credits and bonus usage$),$ register to any session, attend to session, and update their planned registration if there is available session within in same week. If the user registered to any sessions $(2/3$ sessions they can attend$),$ they can not move it to following weeks unless confirmed by the branch managers. The branch manager can add$/$update trainers and assign trainers to the sessions. The trainers can also use the mobile app to take the attendance by using a session created QR code.