GST registration procedure requires timely application, PAN-based eligibility, Aadhaar authentication, and verification before grant or deemed registration. Persons liable to registration under the GST law must apply in each State or Union territory within thirty days of becoming liable, while casual taxable persons and non-resident taxable persons must apply at least five days before commencing business. The provision also requires separate registration for certain Special Economic Zone-related persons, permits voluntary registration, treats multiple registrations and inter-State establishments as distinct persons, and prescribes PAN-based eligibility with Aadhaar authentication requirements, alternate identification, and notified exemptions. It further provides for registration of non-compliant persons by the proper officer, Unique Identity Numbers for notified entities, verification-based grant or rejection, issuance of a certificate, and deemed grant if no deficiency is communicated within the prescribed period.