New DELHI, Sept. 20 -- Domestic LPG consumers will have to complete biometric Aadhaar authentication to book refills at the regulated retail selling price with applicable subsidy from October 1, the government said on Saturday. As of September 19, 274.3 million active domestic LPG consumers (89.9% of the total) had completed biometric Aadhaar authentication, according to the petroleum and natural gas ministry.P4...