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

India just took its next major step in becoming a cashless society.
SEE ALSO: Inside UPI: How India is bringing mobile banking to 1.3 billion people
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 their bank name, input their unique Aadhaar number and scan their fingerprint, which acts as a password to make the

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