Exact Online is the leading cloud-based accounting software in the Netherlands and Belgium, with growing adoption across the UK, Germany, and other European markets. For developers building financial integrations, vertical SaaS products, or multi-tenant applications, the Exact Online API is essential—but it comes with unique challenges that trip up even experienced teams.

What You'll Learn

How Exact Online's OAuth 2.0 flow works (and its unusual requirements)

REST API structure with OData filtering

Rate limiting strategies and how to handle them

Multi-division architecture and why it matters

Working code examples in Python and JavaScript

How to reduce integration complexity by 10x with unified APIs

Understanding the Exact Online API Architecture

Two APIs, Different Purposes

Exact Online provides two distinct APIs:

API Type Protocol Use Case Limitations

REST API OData-based REST Primary integration method 60 records per request (bulk: 1000)

XML API SOAP/XML Legacy operations, specific actions…