What are the subsystems of a pop machine?

A pop machine typically consists of several key subsystems, including the refrigeration system, which keeps beverages cold; the dispensing system, which delivers the selected drink; and the payment system, which processes transactions through coins, bills, or digital payments. Additionally, there may be a carbonation system for carbonated drinks, a control system for user interface and selection, and a storage system for holding the beverages. Together, these subsystems ensure the efficient operation and user experience of the vending machine.