[UML] Order processing state diagram

This UML Order Processing State Diagram provides a comprehensive overview of the order processing workflow, detailing each step from payment initiation to order completion. Key stages include payment processing, inventory deduction, shipping, and customer confirmation of receipt. The diagram also outlines potential disruptions, such as payment failures or order cancellations, and the corresponding actions required, such as exiting payment scenes or prompting customers to repay. By visualizing statuses like 'shipped,' 'paid,' and 'success,' the diagram offers a clear path for managing orders efficiently, ensuring seamless transitions between each phase of the order processing cycle.