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SPECIFICTION
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Twinfield API

developers.twinfield.com

From €58/mo WebAPI
Visit developers.twinfield.com
Spec score 7.1 #22 of 27 in Accounting APIs

Spec sheet

Purpose
The API provides developers with access to Twinfield accounting data and web services.Read 7 Oct 2026 · developers.twinfield.com
Intended users
Twinfield describes its accounting software and API integrations as serving advisors and businesses, with features for collaborative accounting and linking business systems.Read 7 Oct 2026 · wolterskluwer.com
Integrations
Twinfield Bookkeeping says it connects with more than 300 different systems, and integrations must be certified to join its partner community.Read 7 Oct 2026 · wolterskluwer.com
Accounting operations
Available API operations include maintaining transactions, customers, suppliers, invoices, bank statements, budgets, payments, and dimensions.Read 7 Oct 2026 · developers.twinfield.com
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.Read 7 Oct 2026 · developers.twinfield.com
Authentication
Twinfield uses OpenID Connect for identity information and OAuth 2.0 for authentication, with implicit and authorization code flows supported.Read 7 Oct 2026 · developers.twinfield.com
Certification and support
Twinfield requires integrations to be certified and describes a continuing API subscription that includes certification, API support, and Developer Portal access.Read 7 Oct 2026 · assets.contenthub.wolterskluwer.com
Concurrency limit
The API allows up to 20 concurrent requests per ClientId and 10 per ClientId and organisation combination.Read 7 Oct 2026 · developers.twinfield.com
Data retrieval
Browse data can retrieve financial information such as general ledger transactions and sales invoices.Read 7 Oct 2026 · developers.twinfield.com
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.Read 7 Oct 2026 · developers.twinfield.com
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.Read 7 Oct 2026 · developers.twinfield.com
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.Read 7 Oct 2026 · assets.contenthub.wolterskluwer.com
Transport security
Twinfield API supports TLS 1.2 and 1.3; TLS 1.0 and 1.1 have been retired.Read 7 Oct 2026 · developers.twinfield.com

Plans and prices

Extra Boekhouden €58 a month € 58,- per maand 1 user · 5 administrations · Integrations with 300+ applications · Standard reports Read 7 Oct 2026 · wolterskluwer.com
MKB Boekhouden €78.50 a month € 78,50 per maand 1 user · 5 administrations · Integrations with 300+ applications · 38 reports Read 7 Oct 2026 · wolterskluwer.com
Compleet Boekhouden €114.50 a month € 114,50 per maand 1 user (modular) · 5 administrations (modular) · Integrations with 300+ applications Read 7 Oct 2026 · wolterskluwer.com

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