Unit4

Unit4 ERPx REST API

Comprehensive REST API for Unit4 ERPx cloud ERP platform covering time and expenses, personnel, payroll, procurement, project management, customers and sales, inventory management, planning, commitment accounting, accounting, and reporting. Supports OAuth 2.0 and machine-to-machine (M2M) authentication via client credentials flow.

GitHub

Documentation

📖
Documentation
https://develop.unit4rd.com/erpx/
📖
APIReference
https://develop.unit4cloud.com/erpx/reference/
📖
Authentication
https://develop.unit4rd.com/erpx/auth-security/
📖
RateLimits
https://develop.unit4rd.com/erpx/limits-and-quotas/

Other Resources

🔗
Versioning
https://develop.unit4rd.com/erpx/version_deprecation/
🔗
Changelog
https://develop.unit4rd.com/erpx/version_deprecation/deprecated_endpoints/2026/

API entry from apis.yml

apis.yml Raw ↑ 
name: Unit4 ERPx REST API
description: Comprehensive REST API for Unit4 ERPx cloud ERP platform covering time and expenses, personnel,
  payroll, procurement, project management, customers and sales, inventory management, planning, commitment
  accounting, accounting, and reporting. Supports OAuth 2.0 and machine-to-machine (M2M) authentication
  via client credentials flow.
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
humanURL: https://develop.unit4rd.com/
baseURL: https://api.unit4.com
tags:
- ERP
- Financials
- HR
- Payroll
- Projects
- Procurement
properties:
- type: Documentation
  url: https://develop.unit4rd.com/erpx/
- type: APIReference
  url: https://develop.unit4cloud.com/erpx/reference/
- type: Authentication
  url: https://develop.unit4rd.com/erpx/auth-security/
- type: RateLimits
  url: https://develop.unit4rd.com/erpx/limits-and-quotas/
- type: Versioning
  url: https://develop.unit4rd.com/erpx/version_deprecation/
- type: Changelog
  url: https://develop.unit4rd.com/erpx/version_deprecation/deprecated_endpoints/2026/