Question: how to do aadhaar authentication?
Answer: Go to URL https://resident.uidai.gov.in/offlineaadhaar. Enter 'Aadhaar Number' or 'VID' and mentioned 'Security Code' in screen, then click on 'Send OTP' or 'Enter TOTP'. The OTP will be sent to the registered Mobile Number for the given Aadhaar number or VID.