Aadhaar authentication requirement expanded to certain non-individual representatives for GST registration, with alternate ID if Aadhaar absent. Notification requires Aadhaar authentication of possession for specified non-individual persons-authorised signatories, managing and authorised partners, and the Karta of an HUF-to be eligible for GST registration, and provides that if Aadhaar is not assigned alternate means of identification shall be offered as prescribed by the rules.