To buy a book electronically from Amazon.com, a customer needs to select the book from a list provided by Amazone Commerce system, provide credit card information to the system, then the system gets authorization from the bank for the payment, and -- if positive -- confirms the sale. The order is then sent to the orders department and when the book becomes available, it is shipped to the customer. Also, the order department charges the customers credit card by informing the bank of the amount.

Draw a sequence diagram that models this process. Make sure to model all relevant actors and the interactions between them. Do show explicitly the time intervals when different actors actively participate in the process you are modeling.