Which mobile payment innovation first allowed presidential campaigns to collect small donations instantly by swiping credit cards on smartphones?

Throughout history, political campaigns have leveraged cutting-edge technology to reach voters in new and innovative ways. From the first televised debate between Kennedy and Nixon to modern digital microtargeting, technology has transformed how politicians connect with constituents. This trivia question focuses on a groundbreaking mobile commerce innovation that revolutionized political fundraising in the 2010s.

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Square Reader, first deployed at scale by Obama's 2012 campaign
PayPal Mobile, pioneered by McCain's 2008 campaign
Apple Pay, introduced during Clinton's 2016 campaign
Venmo, first implemented by Sanders' grassroots fundraising team