Which retail payment innovation was first introduced by IBM in 1973, revolutionizing checkout systems worldwide?

The way we pay for goods has transformed dramatically over the decades. From cash registers to contactless payments, retail payment systems have a fascinating history that reflects both technological innovation and changing consumer habits. This trivia question explores a pivotal moment in payment system history that forever changed how we shop.

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Universal Product Code (UPC) barcode scanning
Electronic signature pads for credit card verification
Magnetic stripe card readers
Digital receipt printers