Aadhaar authentication requirement for GST registration ensures Aadhaar-based verification, with alternate ID where Aadhaar is unavailable. Notification prescribes Aadhaar authentication as a qualification for registration under the Meghalaya GST rules by requiring individuals to undergo Aadhaar authentication per rule 8, and mandates alternate and viable means of identification under rule 9 where Aadhaar is not assigned; issued under sub-section (6B) of Section 25 of the Meghalaya GST Act, 2017 and fixing the commencement date for this requirement.