Which retail payment innovation was first widely implemented in U.S. military exchanges (PX/BX) in the 1970s, years before becoming standard in civilian retail?

The Post Exchange (PX) system has been a crucial part of military life for centuries, evolving from simple sutlers following armies to sophisticated retail operations. These military stores not only provide essentials and comforts to service members worldwide but have also pioneered retail innovations that later influenced civilian markets. This poll tests your knowledge about a groundbreaking retail payment innovation that originated in military exchanges before becoming commonplace in civilian retail.

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Barcode scanning at checkout
Electronic funds transfer at point of sale (EFTPOS)
Self-checkout kiosks
Contactless payment systems