From October 1, Biometric Aadhaar Authentication (BAA) will become mandatory for domestic LPG consumers to book refills at the regulated retail selling price with applicable subsidy. Those yet to complete the authentication will be able to book subsidised refills at the regulated retail selling price once the process is completed. Consumers can complete BAA during refill delivery, at their LPG distributor's showroom or through the mobile applications of the three public sector oil marketing companies (OMCs).