An online shopping portal allows their customers to register to the portal. The user can log in to the system anytime to browse items and add them to the shopping cart. The user also can view his shopping cart. The customer can edit the final cart, submit the order to the payment, or log out from the website without buying any items. The site's administrator can add or update the items shown on the website. Also, can manage the registration of new customers to ensure the correct information of the registered customers.

Please draw a use case diagram for the online shopping system.