Twinfield API

Plans and prices

Every plan, in full

On the record

Accounting operations

Available API operations include maintaining transactions, customers, suppliers, invoices, bank statements, budgets, payments, and dimensions.developers.twinfield.com · read 7 Oct 2026

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.developers.twinfield.com · read 7 Oct 2026

Authentication

Twinfield uses OpenID Connect for identity information and OAuth 2.0 for authentication, with implicit and authorization code flows supported.developers.twinfield.com · read 7 Oct 2026

Certification and support

Twinfield requires integrations to be certified and describes a continuing API subscription that includes certification, API support, and Developer Portal access.assets.contenthub.wolterskluwer.com · read 7 Oct 2026

Concurrency limit

The API allows up to 20 concurrent requests per ClientId and 10 per ClientId and organisation combination.developers.twinfield.com · read 7 Oct 2026

Data retrieval

Browse data can retrieve financial information such as general ledger transactions and sales invoices.developers.twinfield.com · read 7 Oct 2026

Integrations

Twinfield Bookkeeping says it connects with more than 300 different systems, and integrations must be certified to join its partner community.wolterskluwer.com · read 7 Oct 2026

Intended users

Twinfield describes its accounting software and API integrations as serving advisors and businesses, with features for collaborative accounting and linking business systems.wolterskluwer.com · read 7 Oct 2026

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.developers.twinfield.com · read 7 Oct 2026

Purpose

The API provides developers with access to Twinfield accounting data and web services.developers.twinfield.com · read 7 Oct 2026

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.developers.twinfield.com · read 7 Oct 2026

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.assets.contenthub.wolterskluwer.com · read 7 Oct 2026

Transport security

Twinfield API supports TLS 1.2 and 1.3; TLS 1.0 and 1.1 have been retired.developers.twinfield.com · read 7 Oct 2026

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