Please answer this as soon as possible!

Draw the use case diagram of the online Pharmacy Management System where the "Patient creates a cart, add item(s) to the cart, make sure the items are valuable in the stock. When the cart is filled with all items, do checkout, and make payment. Also show the staff while he maintains items (add, delete, and update) of items to the data store. Include all the use cases and actors that will make the use case diagram complete and understandable