Draw a sequence diagram depicting a successful sale scenario for the case study described above.
Case study:
Students and staff purchase ready to eat snack-foods such as chocolate bars, cookies, chips, drinks, etc. using an automated vending machine. Each snack-item has a price and a name.
Any customer can buy an item, using funds available on the university identity card to pay for it. Cash payments are not allowed. The vending machine has a card reader. Customers tap their ID card against the card-reader. The card-reader reads the card and stores its details for the duration of the interaction. After the card is verified, the customer may choose the snack item and opt to buy it. The vending machine will verify that there is sufficient balance on the card to pay for the item and automatically deducts the amount towards the purchase of the snack-item if sufficient funds are available. The customer can buy as many items as they’d like.
Task: Draw a sequence diagram depicting a successful sale scenario for the case study described above.
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