About the working principle of the vending machine do you want to really know

Active vending machine work principle: choose goods, vending machine program can suggest to the backend server receiving request qr code ( WeChat, pay treasure or other electronic pay) Manifest, qr code directly in the vending machine on the screen. Customers scan code, backend server will query if payment account received the money. If received, backend server will be announced to the vending machine instructions of shipment, shipment vending machine according to the instruction. Principle of intelligent vending machine function, also is messy, and some don't need to payment according to the input of the code can also shipment to pick up the goods. Principle is customer input delivery code maybe lottery ticket code, vending machine to send the code to pick up the goods to the background server, a backend server to verify code to pick up the goods, and send the corresponding shipping instructions to the vending machine, vending machine based on instructions from the corresponding products.