Non-resident taxable person registration requires ID, Indian resident authorised signatory, supporting business and bank proofs online. The online registration requires primary identification for the non-resident (PAN, passport, or foreign tax identification), designation of an Indian resident authorized signatory with Aadhaar and acceptance declaration, uploads of passport/visa, proof of principal place of business, Indian bank account proof, and authorization/resolution appointing the signatory; PAN and Aadhaar are subject to online validation, acknowledgment is generated on successful validation, no fee is payable, and specified entities must file using an approved digital signature.