Customs rules require importers to provide detailed origin information and enable verification of Certificates of Origin for preferential claims. Guidelines implement section 28DA and CAROTAR, 2020 requiring importers claiming preferential rates to hold and furnish specified information and COO support demonstrating compliance with Rules of Origin; customs must first request information from importers and may then seek verification from the Board's nodal point when doubts on genuineness or origin persist. Procedural requirements include representative COO selection, Commissioner approval for verification requests, prescribed timelines, referral to Risk Management Centre for non-compliance, and mandatory ICES data fields, eSanchit COO upload with IRN, and defacement of COOs before out-of-charge.