Write Use cases and sequence diagram/s for the following Case-Study:

XYZ Corporation sells books and CDs using through online shopping. The customer adds items to his shopping cart. He may remove items or go to the check-out to make his purchases at any time. The customer reviews his purchases, chooses a payment method, and pays. A sales employee at XYZ Corporation gets the order and purchase confirmation from the system, and sends the electronic order to the warehouse. The warehouse employee updates the order status. The customer may check the order status.