<h1>Aadhaar authentication requirements for GST registration: biometric and document checks must be completed or ARN will be withheld.</h1> Rule 8 CGST Rules guidance requires non Aadhaar applicants to complete photo capture and document verification at a designated GST Suvidha Kendra after scheduling, while Aadhaar opting applicants identified for biometric authentication must ensure promoters/partners and the Primary Authorized Signatory complete biometric authentication, photo capture, and document verification as specified. Prior biometric verification for a promoter/partner in any State/UT exempts repeat biometric capture for subsequent registrations, though PAS may still require document verification. Failure to complete required GSK procedures within the prescribed time frame after submission of Part B of REG 01 will prevent generation of the Application Reference Number (ARN); taxpayers should ensure Aadhaar demographic accuracy to avoid authentication failures.