Duty Credit Scrip registration governs port based issuance, usage, validity and procedural requirements for claiming export rewards. Chapter 3 prescribes online application and documentation procedures to claim MEIS and SEIS incentives, distinguishing EDI and non EDI port processes, requiring linked shipping bills and e BRCs, permitting single applications for multiple EDI ports but separate applications for each non EDI port, and mandating RA scrutiny and three year document retention. Duty Credit Scrips are issued with a single port of registration, must be registered before use, may be split under EDI conditions, and are subject to validity and revalidation rules; proof of landing requirements and Risk Management System verifications govern compliance.