
APIs > Document API
Securely upload and download loan-related documents within arc OS through a single, compliant API.
Securely manage loan-related documents with ease. This API enables authorized lenders and partners to upload and download documents tied to loan applications within arc OS, ensuring fast, efficient, and compliant document handling.

Upload and download loan documents in real-time via dedicated endpoints.

Upload and download documents in multiple formats.

Token-based authentication ensures secure, authorized access to your documents.

Backward compatibility is maintained as the API evolves over time.

how it works
A straightforward document flow
The Document API follows a clear authentication-then-action pattern for all upload, download, and metadata operations.
1. An external system authenticates using its API key and token.
2. The external system uploads required documents to arc OS via the /upload endpoint, along with the loan application number and lender identifier.
3. arc OS stores the documents securely and associates them with the corresponding loan application.
4. When needed, the external system retrieves documents via the /download endpoint.
5. The external system can also retrieve document metadata via the /metadata endpoint for additional context about specific files.
Use Case
A mortgage processor needs to attach income verification documents to a loan application in arc OS from their document management system. Using the Document API, the external system authenticates, uploads the files to the correct application via the /upload endpoint, and retrieves processed documents later via /download — all without manual intervention.

Centralized document management
All loan documents are stored, retrieved, and tracked in one place, simplifying oversight and reducing the risk of version inconsistencies.
Automation and efficiency
Automated upload and download processes eliminate manual file handling, saving time for processors and system administrators alike.
Seamless external integration
Connect your existing document management systems directly to arc OS — no manual data entry, no duplication of effort.
Faster application processing
Documents reach the right application instantly, reducing delays caused by manual uploads and enabling faster loan decisions.
Audit-ready document trails
Every upload and retrieval is tied to a specific application and lender identity, creating traceable, compliant records for audits and reviews.
Rich document metadata
The /metadata endpoint gives external systems on-demand access to document details, enabling smarter workflows and better status visibility.
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For step-by-step details, check out our Quick Start Guide.
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