GST registration requires filing FORM GST REG 01 with identity, business details, verification, consent and specified documents. Form GST REG 01 requires taxpayer identification (PAN, legal and trade names), constitution of business, place(s) of business, authorised signatory details, optional composition declaration, Aadhaar consent for authentication, and specified documentary uploads (proof of constitution, premises, bank account, photographs, and authorization). The portal validates PAN/Aadhaar/DIN/CIN and primary contact OTP; digital signature/e sign requirements vary by applicant type. On approval a registration certificate is issued on the portal, effective from the date liability arose if filed within 30 days, otherwise from the date of registration.