Which retail payment innovation was first introduced by IBM in 1973, fundamentally changing how stores processed transactions?

Before electronic payment systems transformed retail forever, stores relied on various mechanical methods to process transactions. The introduction of early payment technologies marked a pivotal moment in retail history, changing how merchants operated and customers shopped. This trivia question explores a significant milestone in retail payment evolution that helped bridge the gap between manual cash registers and today's digital systems.

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The electronic barcode scanner
The magnetic stripe credit card reader
The digital cash register with inventory tracking
The customer-operated PIN pad for debit transactions