Aadhaar authentication required for authorised signatories, partners and Karta to secure GST registration; alternate ID allowed if absent. Authorised signatories, managing and authorised partners of partnership firms, and the Karta of an HUF must undergo Aadhaar authentication of possession to be eligible for GST registration, with alternate means of identification provided where Aadhaar is not assigned, as prescribed in the relevant State GST rules.