Coffee vending machine: It is a vending system that can work for different prices of coffee. It works with coins. It should calculate the ammount difference and be able to refund extra money. The user...

Coffee vending machine: It is a vending system that can work for different prices of coffee. It works with coins. It should calculate the ammount difference and be able to refund extra money. The user will first select the product, the vending system will print the price on the screen, then the user will throw the money, the system will check the amount of money when the buy product button is pressed, if the amount of money is suitable, it will check whether the product is in the system, and if the product is available, it will deliver the coffee. It will refund extra money to customer.

1) Draw the sequence diagram for the scenario given above.
2) Draw the class diagram for the given scenario.

Thank you so much.