When a customer creates a purchase order through the website, the Employee ID is left empty, and the transaction status is set to pending. When the customer comes to the store and picks up the order, the purchase order is updated as following: (1) Employee ID of the employee who processed the order is added, (2) transaction status is set to completed, and a sale transaction is completed. The customer and/or the employee can print a receipt for the order.

Draw a Sequence Diagram for the sequence of operations taking place when customer creates a new purchase order through the Website, until the moment the order is picked up by the customer. You should come up with appropriate method names, and specific method calls to complete the task.