Which retail payment innovation was first introduced in 1950 by Diners Club and is often credited with revolutionizing consumer purchasing?

Before digital wallets and contactless payments dominated retail, several technological innovations fundamentally changed how consumers paid for goods. One particular invention in the mid-20th century revolutionized retail by allowing customers to make purchases without carrying cash, leading to dramatic changes in consumer spending habits and retail business models. Test your knowledge about this pivotal moment in retail payment history!

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The universal product code (UPC barcode)
The modern credit card (charge card)
Electronic cash registers with digital displays
Automated check verification systems