Consider the following scenario:

A customer visits the online shopping portal. A customer may buy item or just visit the page and logout. The customer can select a segment, then a category, and brand to get the different products in the desired brand. The customer can select the product for purchasing. The process can be repeated for more items. Once the customer finishes selecting the product(s) the cart can be viewed, if the customer wants to edit the final cart it can be done here. For final payment the customer has to login the portal, if the customer is visiting for the first time he must register with the site, else the customer must use the login page to proceed. Final cart is submitted for payment and card details and address (where shipment has to be made) are be confirmed by the customer. Customer is confirmed with a shipment Id and delivery of goods within 15 days.

Model a UML state transition diagram for the above scenario.