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Dear @Victor Fertin,
Good day! Welcome to Microsoft Q&A forum!
Based on your description, I understand that you're trying to access purchase invoice documents stored in Business Central through Continia Document Capture. While you've located the related CS_ tables and can retrieve invoice metadata, you're unable to find a link or endpoint that provides access to the actual attached documents, even after assigning the CDC Basic permission set.
To ensure you receive guidance from specialists with deep experience in both Business Central and Continia Document Capture integrations, I kindly recommend posting your findings and any follow-up details in the Dynamics Community Forum Thread for Small and medium business | Business Central, NAV, RMS: https://community.dynamics.com/forums/thread/?discussionforumid=5f8261f4-4d87-ef11-ac21-7c1e520a09df
The Dynamics Community is monitored by Microsoft partners, MVPs, and product experts who may be able to provide insight into how Document Capture stores and exposes attachments.
Thank you for your kindness and understanding!