Twinfield API review
A Twinfield API for traditional accounting integrations, built around SOAP/XML and sales-led access.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Twinfield API provides programmatic access to Twinfield Boekhouden for software partners and organizations integrating accounting workflows. It covers authentication, master data, sales and purchase invoices, transactions, journal transactions, financial data browsing, reporting and payment-related data. The cloud API supports small businesses, mid-market organizations and enterprises that need two-way accounting synchronization rather than a standalone accounting application.
Its integration model combines OAuth 2.0 and OpenID Connect with SOAP/XML web services. Developers can read, create or modify sales invoices, process purchase and sales transactions, create journal transactions, maintain master data and access financial reporting data. A sandbox supports development, while API credit rate limits and concurrency controls provide defined operating boundaries. Documentation is the listed support channel, and GDPR is part of the product's compliance posture. This makes Twinfield API a fit for teams already working with Twinfield's accounting model or maintaining traditional accounting integrations.
Access is sales-led rather than self-serve: certification and an ongoing API subscription are required, and there is no free plan. Integrations also operate within rate-limit and fair-use requirements. Teams that need a Twinfield-specific connection, SOAP/XML coverage and accounting workflow depth should consider it. Organizations prioritizing webhook-driven event handling, broad self-service pricing or a modern REST-first integration experience should evaluate another accounting API instead.
Twinfield API pros and cons
- Where it wins
- OAuth 2.0 and OpenID Connect authentication
- Two-way invoice, transaction and journal workflows
- Sandbox access with API rate and concurrency controls
- Where it doesn't
- Requires certification and an ongoing API subscription
- SOAP/XML emphasis may limit fit for newer API stacks
- No verified webhook support is published
Twinfield API fact sheet, pricing and score →
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