Which retail payment innovation was first introduced by Diners Club in 1950, revolutionizing how consumers could purchase goods without carrying cash?

Throughout history, retail innovations have dramatically changed how people shop and how merchants sell. From ancient marketplaces to modern digital experiences, retail payment systems have evolved to meet changing consumer needs and technological capabilities. This trivia question focuses on a pivotal moment in retail payment history that fundamentally transformed the shopping experience in the 20th century.

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The universal barcode system
The first general-purpose credit card
The electronic cash register
The automated check processing system