How does Coinme ATM work?

I'm curious to know how exactly does the Coinme ATM operate? I've heard that it allows users to buy and sell cryptocurrencies in a seamless manner, but I'm not quite sure about the step-by-step process. Can you explain to me the intricacies of using a Coinme ATM, from the moment you approach it to the moment you walk away with your cryptocurrency or cash? How do users go about selecting the cryptocurrency they want to trade, making payments, and receiving their coins or fiat? Also, what kind of verification is required and what precautions does the machine take to ensure security during transactions?