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What is a Unified API?

A unified API provides a single, standardized interface to interact with multiple third-party providers. Instead of learning each provider’s unique API format, authentication scheme, and data model, you write code once, and StackOne handles the differences. What StackOne normalizes:
  • Data models – Consistent field names and structures across providers (e.g., files in Google Drive, SharePoint, and Dropbox all return the same schema; users in Google Workspace, Okta, and 1Password all return the same schema)
  • Authentication – OAuth, API keys, and tokens are managed per-provider; you just pass an x-account-id header
  • Pagination – Cursor-based pagination works the same regardless of whether the provider uses offsets, pages, or cursors
  • Error formats – Standardized error responses with provider-specific details when available
Building AI agents? Use the MCP Server, an AI Toolset SDK, or the Actions API (RPC) instead — same data, optimized for LLM tool calling.
The StackOne unified API handles financial data management across diverse accounting platforms, managing variations in chart of accounts, transaction structures, and reporting formats while supporting customer-specific workflows and compliance requirements. It enables financial data synchronization, reporting, and analysis without relying on provider-specific schemas. With 2-way API interaction, accounting systems can efficiently manage financial data from multiple sources through a single integration.

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Benefits of the Accounting API

StackOne’s APIs support real-time data polling, allowing for immediate updates and synchronization across platforms.
With a focus on security, StackOne’s architecture avoids unnecessary data storage, maintaining compliance with data protection regulations.
Both synthetic and native webhooks, enable real-time notifications for tickets and comment events.
StackOne offers pre-built connectors with a wide range of platforms, simplifying the integration process.

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Key Features

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StackOne SDKs & OpenAPI Specification

Use our official SDKs for faster integration. Build with language-native libraries. Full list here.

OpenAPI Specification

Popular SDKs

Node.js Java (JVM) PHP Ruby

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Entity Model and Relationships

The following diagram illustrates the key entities within the Accounting API:

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Entity Definitions