Which retail payment innovation was directly developed as a result of military needs during World War II?

During World War II, military necessity drove significant innovations in retail payment systems and consumer experiences. Many technologies and practices we take for granted today originated from wartime challenges. This trivia question explores how military history intersected with retail innovation during one of history's most transformative conflicts.

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The Diners Club card, created to streamline officer meal payments
The bank credit card with magnetic stripe, developed from military ID technology
The modern charge plate system, based on military dog tag imprinting technology
Traveler's checks, designed for troops stationed overseas