Which contactless payment innovation was first widely adopted by major sports stadiums to reduce concession lines and increase per-fan spending?

Major sporting goods retailers and stadiums have transformed how fans pay for merchandise and experiences over the years. This trivia question tests your knowledge about a significant payment innovation in the sports retail industry that changed how fans interact with their favorite teams and venues.

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RFID wristbands linked to credit cards
QR code payments via team mobile apps
Facial recognition payment systems
Biometric fingerprint payment terminals