# Step 2 — Implementation Detail

1. Validate site and library scope before retrieval.
2. Resolve the Graph token from the configured secret reference.
3. List drive children and filter by folder and supported file extensions.
4. Retrieve file content and map MIME type, eTag, web URL, modification time, and tenant ACL.
5. Implement Graph delta-token incremental retrieval and deleted-item detection.
6. Map subscription notifications into Change records with subscription and sequence metadata.
7. Add SharePoint PDF normalization coverage.