Aadhaar authentication for GST registration mandated; alternative identification allowed when Aadhaar is not assigned to proceed. Notification prescribes that individuals must undergo Aadhaar authentication as the eligibility condition for GST registration under the applicable Rajasthan GST rules, and that persons not assigned an Aadhaar number shall be offered an alternate and viable means of identification as prescribed in the rules; it also fixes the commencement date for the obligation and the alternate identification safeguard.