Which country pioneered the concept of 'unmanned convenience stores' where customers shop without any staff present, using just their smartphones for entry and payment?

Test your knowledge about innovative retail concepts that have been shaped by their geographic origins! Many of today's most influential retail innovations emerged from specific locations around the world, adapting to local cultures and eventually spreading globally. This question focuses on a groundbreaking retail concept that revolutionized shopping experiences in a particular country before becoming an international phenomenon.

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China
Sweden
South Korea
Japan