<h1>Biometric Aadhaar authentication now required for certain GST registrations, and appointment-based GSK verification follows, with OTP alternative available.</h1> An amendment to Rule 8 enables Biometric-based Aadhaar Authentication and document verification via GSTN. After filing Form GST REG-01 applicants receive either an OTP Aadhaar link or a link to book a GST Suvidha Kendra appointment; if booked, they must attend the GSK with the appointment confirmation, jurisdiction details, original Aadhaar and PAN, and original uploaded documents. Biometric authentication and verification at the GSK are required for individuals in REG-01, and ARNs are generated only after these processes are completed.