Doubts regarding physical reporting at IIIT Kottayam

Hi everyone, I have a few doubts regarding the documents required for physical reporting:

1. Document Verification Completion and Seat Acceptance Letter: Where can I get/download this document issued by JoSAA/CSAB?

2. Character & Conduct Certificate: I passed Class 12 in 2025 and already have a certificate from my school. The notice says it needs to be endorsed by a Gazetted Officer. What exactly do I need to get endorsed — the original, a photocopy, or both?

3. Fees: Should the institute fee be paid online before physical reporting, or can we pay it at the institute during reporting?

4. Institute admission website: Regarding the IIIT Kottayam admission website, what exactly are we supposed to do there before reporting? Is there any registration/form/document upload that needs to be completed?

Would appreciate any clarification from students who have already gone through this process. Thanks!