Which e-commerce innovation first allowed language learning companies to offer 'pay-per-lesson' micropayment models for live tutoring with native speakers?

The language learning and linguistics industry has evolved significantly in the digital age, with e-commerce platforms playing a crucial role in how language products are marketed and sold globally. This trivia question explores a groundbreaking e-commerce innovation that revolutionized how language learning products are distributed and accessed. Test your knowledge about the intersection of linguistics, technology, and digital marketing!

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Duolingo's 'Language Token' system (2015)
iTalki's integrated payment platform (2011)
Rosetta Stone's Virtual Classroom Marketplace (2013)
Babbel's FlexLearn payment structure (2014)