Consider an online shopping portal that allows a customer to browse and purchase different products. There are distributed stores and customers are of different countries and religions. The products are arranged under different categories like Books, Computers, and Electronics, etc. Only a registered customer can order a product from this portal. Each registered customer will have his own shopping cart. He can view, add or remove products in his shopping cart and view his total bill. The final cart is submitted for payment and details like shipment address are confirmed by the customer. The customer is confirmed with a shipment id and delivery of goods within 15 days. Once the customer finishes selecting the product/s, he can view the cart and then place the order by providing details like postal address, number of items, etc. The website is managed by an Administrator. An administrator can add, remove and update categories, products under each category, their price, and quantity. He can also remove or verify the customer. Draw a sequence diagram for online shopping portal scenario.