Which payment innovation, first introduced in 1950 by Diners Club, fundamentally transformed retail payment systems and is often considered the first universal credit card in history?

The history of retail payment systems represents a fascinating journey of innovation that has transformed how we shop. From simple cash transactions to complex digital payments, these systems reflect changing consumer needs and technological advancement throughout history. This trivia question focuses on a pivotal moment in payment technology that revolutionized retail transactions in the 20th century and set the foundation for modern shopping experiences.

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The Diners Club card, which allowed members to pay at multiple participating restaurants with a single card
The American Express Travelers Cheque, which allowed consumers to make secure payments while traveling abroad
The Sears Charge Plate, which allowed customers to make purchases at any Sears store location nationwide
The BankAmericard (proto-Visa), which was the first card to offer revolving credit directly through a banking institution