Which government initiative pioneered the world's first nationwide digital ID system specifically designed to revolutionize retail transactions and reduce cash dependency?

Test your knowledge about how governments have influenced retail innovation through policy initiatives and public-private partnerships! The intersection of politics and retail has led to fascinating developments as governments seek to modernize commerce, support local businesses, and adapt to changing consumer behaviors. This trivia question focuses on a groundbreaking government-led retail innovation program that has been widely studied as a model for other countries.

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India's Unified Payments Interface (UPI) and Aadhaar system
Estonia's e-Residency program
Singapore's Smart Nation retail authentication framework
Sweden's BankID retail payment infrastructure