Purpose of the Activity Diagram

The activity diagram illustrates the sequence of steps involved when a user performs a transaction on PayPal. This includes logging in, selecting a payment method, processing the transaction, and receiving confirmation. It highlights the interactions between the user and the system, decision points, and alternate paths (like transaction failure).

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Main Flow of Activities

Start

• The process begins when a user opens the PayPal application or website.

 

User Authentication

• The user logs in using credentials (email/phone + password).
• The system verifies the credentials.
• If login fails, the system prompts to re-enter or recover credentials.

Choose Transaction Type

Once authenticated, the user selects the type of transaction:

• Send money
• Request money
• Pay for goods/services

 

Enter Recipient Details

• The user enters the email or phone number of the recipient.
• The system checks if the recipient is registered with PayPal.

 

Enter Payment Amount

• The user specifies the amount to be sent.
• Optionally, a note can be added.

 

Select Payment Method

The user chooses from linked payment options:

• PayPal balance
• Bank account
• Credit/debit card

 

Validate Payment Details

The system validates:

• Available balance or card limits
• Currency compatibility
• Account restrictions (if any)

 

Decision: Is Validation Successful?

• Yes: Proceed to next step.
• No: Error is displayed, user is prompted to correct or try another method.

 

Confirm and Submit Payment

• The user confirms transaction details.
• The payment is submitted to the PayPal server.

 

Transaction Processing

• The system processes the payment.
• Deducts the amount from the sender.
• Credits it to the recipient’s account.

 

Generate Notification

• System sends transaction confirmation to both parties via email/SMS/app.

 

Transaction Completed

• Status is shown to the user with a unique transaction ID.

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Visual Elements in the Activity Diagram

You can include these visual symbols in the diagram when drawing:

 

• Rounded ovals: Start and end points
• Rectangles: Actions like “Enter Amount”, “Confirm Payment”
• Diamonds: Decision nodes such as “Is Validation Successful?”
• Arrows: Flow from one activity to another
• Swimlanes (optional): To separate user actions from system actions