Create a use case diagram that demonstrates how the staff at Pet Vet will interact with an application to order medications to re$-$stock the clinic's inventory. Assume the staff uses a web browser to access the medication app, searches for a type of medication, indicates the quantity they wish to order, and pays by a company credit card. The medication app will need to check its inventory system before accepting the order, then validate the user's credit card, and return an appropriate message to the user $($the Pet Vet staff member$).$

Note: no logic is used. Simply show who uses the system and the simple actions they will take. This is a very high$-$level view of the process.

Keep in mind: identify the actors for this scenario, including external systems or applications involved. This is important: the medication ordering application IS the system $("$the box"$)$ within which all use cases take place. The medication ordering app is NOT an actor outside the box.