Which point-of-sale innovation was FIRST widely adopted by major sports stadiums to reduce concession wait times?

Modern sports venues are evolving rapidly with technological innovations to enhance fan experience and operational efficiency. Point of sale systems in stadiums have undergone significant transformation in recent years, with contactless payments, mobile ordering, and integrated loyalty programs becoming increasingly common. How well do you know the latest POS innovations that are changing the game-day experience for sports fans worldwide?

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Mobile ordering with in-seat delivery
Grab-and-go stores with automated checkout
Handheld POS terminals for roaming vendors
Biometric payment systems using fingerprint/facial recognition