Which point-of-sale innovation has revolutionized concession sales at major sports stadiums in the last decade?

Modern sports venues have transformed from simple arenas to sophisticated retail environments. Major stadiums now incorporate advanced point-of-sale systems to handle massive transaction volumes during games and events. These systems not only process payments but collect valuable customer data, enable personalized marketing, and help optimize inventory management across multiple concession stands. How well do you know the technology powering the retail side of your favorite sports venues?

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Mobile ordering systems allowing fans to order from seats and receive notifications when orders are ready for pickup
Facial recognition payment systems that automatically charge customers based on biometric identification
Virtual reality interfaces where customers can visualize merchandise before purchasing through holographic displays
Drone delivery systems that transport food and beverages directly to spectator seats