Inside India's plan to substitute cash with its citizen's fingerprints

India just took its next major step in becoming a cashless society.
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IDFC Bank has launched an app called Aadhaar Pay that aims to help millions of its citizens without a smartphone to pay for their purchases digitally with just their fingerprint. 
Merchants will be able to download the app on their Android smartphones and attach a fingerprint scanner device. To make payments, buyers will only have to choose the