A major upgrade is loading in UPI, which will change the method of payment. Earlier, only a numeric PIN was required to authorize any transaction, but now, from October 8, users can use their face and fingerprint instead of a numeric PIN.
This new authentication is powered by Aadhar data, which is approved to make transactions faster, easier, and more secure across the country. As Aadhaar already stores our fingerprint, iris scans, and facial data, which will now be used in UPI, now when a user makes a payment, they will have to approve by scanning their face or fingerprint through supporting devices.
There is no rule that you cannot do transactions from a numeric PIN. But this new method will add a layer of security to the system. The Reserve Bank of India announced a new rule of payment that adds two-factor authentication (2FA) beyond the SMS-based one-time password, which will come into effect from April 1.
SOURCE: THETATVAINDIA

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