Aadhaar authentication requirement for non-individual GST registrants' authorised representatives to establish registration eligibility with alternate identification permitted. Notification requires Aadhaar authentication for the authorized signatory of all entity types, managing and authorized partners of partnership firms, and the Karta of a Hindu undivided family as a condition for GST registration; where Aadhaar is not assigned, alternate viable identification methods specified in the rules are to be offered.