Which retail payment innovation was first introduced by IBM in 1973 and revolutionized checkout systems worldwide?

The retail payment landscape has evolved dramatically over the decades, transforming how consumers interact with brands and complete purchases. From cash registers to contactless payments, each innovation has shaped retail strategy and consumer behavior. This trivia question focuses on a pivotal moment in retail payment history that fundamentally changed the industry and set the stage for modern e-commerce and digital transactions.

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Universal Product Code (UPC) barcode scanning
Magnetic stripe credit card readers
Electronic funds transfer at point of sale (EFTPOS)
PIN pad security systems