Which retail technology innovation first allowed U.S. presidential campaigns to process small-dollar donations in real-time at campaign events, dramatically changing grassroots fundraising?

Modern political campaigns increasingly operate like sophisticated retail operations, with data-driven voter targeting, merchandise stores, and point-of-sale systems at campaign events. This trivia question explores how political campaigns have adopted retail technology to transform their fundraising and voter engagement strategies in the digital age. Test your knowledge about the intersection of retail technology and political campaigning!

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Square card readers attached to smartphones (2012)
PayPal donation buttons on campaign websites (2004)
NFC-enabled campaign buttons and merchandise (2016)
QR code donation systems on campaign literature (2008)