How to Manage Documents and Contracts Across Google Drive, Box, Dropbox, and S3 with a Unified API
October 30, 2025
Most SaaS products rely on documents and contracts that live across multiple storage providers — Google Drive, Dropbox, OneDrive, Box, or S3. Managing these files consistently is difficult when every system has its own schema, authentication model, and permissions logic.
Unified.to simplifies file and contract management through a single unified API. Your product can list, read, download, update, and replace documents across 25+ storage systems — without building or maintaining custom integrations for each vendor.
When to Use Docs & Contracts Management
With a unified API, you can:
- Centralize access to documents and contracts from multiple storage systems.
- Retrieve files and metadata for review, processing, or AI pipelines.
- Update or replace files while preserving links, permissions, and audit metadata.
- Sync downstream systems automatically when files are created, modified, or replaced.
Normalized File Object
Unified.to provides a consistent schema for managing files across providers, based on the Unified File model:
| Object | Description | Key Fields |
|---|---|---|
file | A stored document or contract item | id, created_at, updated_at, name, description, parent_id, user_id, size, mime_type, permissions, download_url, data, version, web_url |
This model supports both structured document storage (e.g., Drive, Box) and object-based storage (e.g., S3), with optional passthrough for provider-specific metadata.
Supported Providers
Unified.to integrates with major storage systems, covering 25+ file and content management platforms, including:
- Google Drive
- Microsoft OneDrive / SharePoint
- Dropbox
- Box
- Amazon S3
See the full list of supported File Storage integrations.
Data Flow for Document & Contract Management
The flow for managing files across providers is consistent and secure:
- Connect — The customer authorizes their storage provider through Unified Connect, returning a secure
connection_id. - List — Retrieve documents, folders, and metadata from the connected source.
- Read or Download — Fetch files for review, AI processing, or compliance workflows using the normalized
download_url. - Update or Replace — Push new versions of files while maintaining consistent references and metadata.
- Monitor Changes — Subscribe to Unified's native or virtual webhooks to detect file edits, replacements, or permission updates in real time.
With Unified's unified schema and real-time delivery, your product can manage contracts and documents seamlessly — regardless of where they're stored.
Why Product Teams Choose Unified.to
For PMs and engineers building document-driven or AI-powered products:
- One API, 350+ integrations — consistent CRUD and webhook behavior across storage systems.
- Real-time sync — track changes and replacements instantly.
- Secure by design — no cached or stored customer data; every request fetches live content.
- Extensible — passthrough metadata and permissions for provider-specific workflows.
Centralize document and contract management across every provider with a single integration.
Start your free 30-day trial or book a demo to see how Unified.to can simplify your file workflows.