Aadhaar authentication required for GST registration; alternate identification methods provided where Aadhaar is not assigned, per rules. Aadhaar authentication is mandated as the primary identity verification for GST registration eligibility under the State GST rules; individuals without an Aadhaar number must be offered alternate viable means of identification in the manner prescribed by the rules. The notification declares its provisions to be in force from the notified commencement date, making the Aadhaar-based authentication requirement and the alternative identification pathway operational under the State GST regulatory scheme.