Activity Diagram of Amazon

Start
The activity begins when the user accesses the Amazon platform. They can be a guest or a registered customer.

User Login / Registration

• If the user is not logged in, they will either log in or register as a new customer.
• If already logged in, the system checks their session validity.

Browse Products

• The user can search for products using filters, categories, or keywords.
• The system displays relevant products based on the search query.

Add to Cart

• The user selects a product and adds it to their shopping cart.
• The system updates the cart with the selected item and shows the updated cart status.

View Cart

• The user can view the cart, modify the quantity of items, remove items, or proceed to checkout.

Proceed to Checkout

• Once the user is satisfied with the items in the cart, they proceed to the checkout page.

Enter Shipping Details

• The user is prompted to provide shipping information (address, delivery preferences, etc.).

Select Payment Method

• The user selects a payment method (credit card, PayPal, etc.).
• The system verifies the payment method and prepares for processing.

Confirm Order

• The user confirms the details of the order (items, shipping address, payment method).
• The system confirms the order and generates an order summary for the user.

Payment Processing

• The system sends the payment details to the payment gateway for processing.
• The payment gateway verifies the transaction and sends back a success or failure response.

Payment Success/Failure

• If the payment is successful, the system updates the order status to “Payment Confirmed.”
• If the payment fails, the user is prompted to retry or select an alternative payment method.

Order Confirmation and Invoice Generation

• Once payment is confirmed, the system generates an invoice and sends an email to the user.
• The order is marked as confirmed, and the shipping process begins.

Order Shipping

• The system notifies the logistics team to process the order for shipment.
• The user receives updates on the shipping status.

End

• The activity ends when the order is delivered to the user.