Which digital product innovation first allowed presidential campaigns to accept small online donations at scale, fundamentally changing campaign financing?

Throughout history, presidential campaigns have pioneered innovative ways to reach voters. From Franklin D. Roosevelt's fireside chats on radio to Barack Obama's groundbreaking social media strategy, candidates have embraced new technologies and methods to connect with the electorate. This trivia question focuses on a significant product innovation that revolutionized how campaigns operate in the modern political landscape.

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ActBlue's donation platform (launched 2004)
PayPal's political donation integration (launched 2000)
FEC's Electronic Filing System (launched 2001)
Facebook's Causes application (launched 2007)