The purpose of the Manage Orders use case is to provide a seamless and efficient process for customers to purchase items, request prices, and for staff to order stocks from a supplier. The use case ensures that customers can easily browse and select items they wish to purchase, and make payments securely. Additionally, customers can request prices for items they are interested in, allowing them to make informed decisions before making a purchase. Staff members can also use the system to order stocks from a supplier, ensuring that the inventory is always up-to-date and available for customers to purchase. Overall, the Manage Orders use case streamlines the ordering process, making it easier for both customers and staff to manage orders and ensure customer satisfaction.