Here is a UML class diagram for a notification system within a software application. It outlines various classes and their attributes related to handling notifications. The main classes shown include 'PaymentNotification', 'Bookings', 'System', 'Reviewer', 'Hotel', 'Notification', and 'TypeNotification'. Each class has its own attributes and methods that define its functionality within the system. This template serves as an essential part of software documentation in the development process.