Which major retail payment innovation was originally developed after its inventor got frustrated waiting in line while his groceries melted?

The evolution of retail payment systems has transformed how we shop and conduct business globally. Behind many of these innovations are fascinating stories of invention, adaptation, and sometimes accidental discovery. This trivia question explores a pivotal moment in payment technology history that changed retail forever and continues to influence modern digital payment trends. Test your knowledge about the origins of a technology we use almost daily!

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Square credit card reader (developed by Jack Dorsey)
The magnetic stripe credit card (developed by IBM engineer Forrest Parry)
PayPal's original payment platform (developed by Peter Thiel and Max Levchin)
The EMV chip card (developed by Europay, Mastercard and Visa consortium)