Which contactless payment technology was first widely adopted by public transit systems before becoming standard in transportation retail hubs?

As transportation hubs evolve into retail destinations, payment systems have transformed to meet the unique needs of travelers on the move. From airports to train stations, point-of-sale systems have undergone significant innovation to handle high-volume, time-sensitive transactions while providing data for operational efficiency. Test your knowledge about this crucial intersection of transportation and retail technology!

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RFID-based fare cards (like London's Oyster card)
QR code mobile payments
Facial recognition payment systems
Bluetooth proximity payments