Twinfield API

developers.twinfield.com · checked 7 Oct 2026

#24 · Accounting APIs

Visit developers.twinfield.com ↗ Alternatives Twinfield API vs Unified.to Accounting API

How it plugs in

—Public API

NoOpen source

NoFree tier

Signal on Accounting APIs5.0#24 of 27

The API provides developers with access to Twinfield accounting data and web services.

Pricing

Extra Boekhouden€ 58,- per maand · 1 user · 5 administrations · Integrations with 300+ applications · Standard reports€58/mo
MKB Boekhouden€ 78,50 per maand · 1 user · 5 administrations · Integrations with 300+ applications · 38 reports€78.50/mo
Compleet Boekhouden€ 114,50 per maand · 1 user (modular) · 5 administrations (modular) · Integrations with 300+ applications€115/mo

As wolterskluwer.com lists them, checked 7 Oct 2026.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: developers.twinfield.com
Price: From €58/mo
Free trial: Not stated
Accounting operations: Available API operations include maintaining transactions, customers, suppliers, invoices, bank statements, budgets, payments, and dimensions.
Accounting tiers: API functions vary by Twinfield user level; sales invoice creation is available at Complete and SME Accounting levels but not Bookkeeping Plus or Basic Bookkeeping.
Authentication: Twinfield uses OpenID Connect for identity information and OAuth 2.0 for authentication, with implicit and authorization code flows supported.
Certification and support: Twinfield requires integrations to be certified and describes a continuing API subscription that includes certification, API support, and Developer Portal access.
Concurrency limit: The API allows up to 20 concurrent requests per ClientId and 10 per ClientId and organisation combination.
Data retrieval: Browse data can retrieve financial information such as general ledger transactions and sales invoices.
Integrations: Twinfield Bookkeeping says it connects with more than 300 different systems, and integrations must be certified to join its partner community.
Intended users: Twinfield describes its accounting software and API integrations as serving advisors and businesses, with features for collaborative accounting and linking business systems.
Payload limit: Twinfield recommends no more than 25 child elements per parent and 500 transaction or invoice lines; each transaction has a hard limit of 1,000 lines.
Rate limits: Certified integrations have a 1,000 API credit per minute ClientId bucket and 500 credit per minute per ClientId and organisation combination; new uncertified ClientIds receive 5% of those amounts.
Security and compliance: The API terms say Wolters Kluwer processes personal data in accordance with applicable privacy law including GDPR and takes technical and organisational measures to protect it.
Transport security: Twinfield API supports TLS 1.2 and 1.3; TLS 1.0 and 1.1 have been retired.

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