# Twinfield — Accounting API: overview > Canonical URL: https://developers.apideck.com/apis/accounting/twinfield/overview Twinfield (Wolters Kluwer) cloud accounting platform. - Status: beta - Authentication: oauth2 - **account type required:** A Twinfield administration (office); registering the OAuth client ID needs a free Wolters Kluwer Account. - **apideck credentials available:** true - **apideck credentials note:** For development and testing; production connections run on your own certified Twinfield client ID. - **authentication note:** Authorization Code flow (OpenID Connect). Each organisation has its own API host, which is resolved before any call can be made. - **beta:** true - **consumer access level:** Consumer authorizes through OAuth and supplies their Twinfield office code, since Twinfield identifies administrations by code rather than by id. - **costs:** The API certification carries a monthly subscription fee; Wolters Kluwer publishes no figure, so confirm it with their partner team when you apply. - **difficulty:** involved - **difficulty reason:** Paid Certified Partner certification with a consultant-reviewed technical audit - **environment notes:** - **description:** Twinfield itself has no sandbox/production selector — one OAuth client ID and one set of credentials serve both testing and live use. The only change at go-live is on the Apideck side: swap Apideck's own credentials (uncertified, development and testing only) for your certified client ID. Testing always targets a real Twinfield administration rather than an isolated mock, so writes post real transactions. - **environment:** Single environment - **external guides:** - **source:** Twinfield - **title:** OpenID Connect authentication - **url:** https://developers.twinfield.com/documentation/api/authentication/openid-connect-auth - **source:** Twinfield - **title:** Fair use policy (rate limits and message limits) - **url:** https://developers.twinfield.com/documentation/getting-started/fair-use-policy - **source:** Wolters Kluwer - **title:** What the certification process covers - **url:** https://wktaaeu.my.site.com/nlcommunity/articles/en_US/Knowledge/Wat-komt-er-aan-bod-tijdens-de-certificering - **important to know:** Invoices, bills, journal entries, payments and bill payments can all be listed and read by id — the invoices list only returns unpaid sales invoices. Bills and journal entries can also be created; invoices, payments and bill payments are currently read-only for creation. A refresh token is invalidated the moment the connecting Twinfield user is deleted, disabled, locked or lets their password expire — or the organisation is deactivated. There is no warning: the first sign is an invalid_grant error, so plan a reconnect path. Certification is an ongoing commitment rather than a launch milestone: Wolters Kluwer deactivates an uncertified integration two weeks after notice, and re-audits certified ones every two years. - **partnership note:** Paid Certified Partner certification gates production; until it is granted, a client ID runs at 5% of the normal rate limits. - **partnership portal name:** Wolters Kluwer Twinfield Certified Partner programme - **partnership required:** true - **partnership url:** https://www.wolterskluwer.com/nl-nl/solutions/twinfield-accounting/functies/koppelingen/partner-worden - **rate limits:** Credit-based — 1,000 credits/minute per client ID, IP and organisation (500 per pair); reads cost 1 credit, writes 3; 20 concurrent requests. - **responsibility matrix:** - **area:** Create Wolters Kluwer Account - **customer:** ✓ - **apideck:** Docs provided - **area:** Complete Twinfield API Certification - **customer:** ✓ - **apideck:** Docs provided - **area:** Register & Configure OAuth Client - **customer:** ✓ - **area:** Add Credentials to Apideck - **customer:** ✓ - **apideck:** Handles OAuth flow - **area:** Authorize Connection (OAuth) - **consumer:** ✓ - **area:** Supply Office Code & Control Accounts - **consumer:** ✓ - **customer:** ✓ (if known upfront) - **apideck:** Maintains connector - **area:** Build via Unified API - **customer:** ✓ - **apideck:** ✓ Automatic - **area:** Token Refresh - **apideck:** Logs & alerts - **area:** Monitor Connections - **consumer:** ✓ Can revoke anytime - **customer:** ✓ Via dashboard - **sandbox available:** false - **sandbox note:** A test administration is provisioned with the certification subscription; there is no self-serve sandbox. - **supported resource categories:** - **name:** Core Financial - **resources:** company-info ledger-accounts journal-entries tax-rates - **name:** Accounts Receivable - **resources:** customers invoices payments - **name:** Accounts Payable - **resources:** suppliers bills bill-payments expenses - **name:** Banking - **resources:** bank-accounts bank-feed-statements payment-methods - **name:** Organizational - **resources:** companies subsidiaries projects tracking-categories - **webhooks:** Virtual webhooks — created and updated events across 11 resources, including customers, suppliers, bills, payments, invoices and ledger accounts. ## Supported resources [Accounting data model](/guides/accounting-data-model.md) - **custom field support:** true - **downstream id:** offices - **downstream name:** Offices - **id:** company-info - **name:** Company Info - **status:** live - **custom field support:** true - **downstream id:** dimensions - **downstream name:** Dimensions - **id:** ledger-accounts - **name:** Ledger Accounts - **status:** live - **custom field support:** true - **downstream id:** dimensions-deb - **downstream name:** Dimensions Deb - **id:** customers - **name:** Customers - **status:** live - **custom field support:** true - **downstream id:** dimensions-crd - **downstream name:** Dimensions Crd - **id:** suppliers - **name:** Suppliers - **status:** live - **custom field support:** true - **downstream id:** transactions-journal - **downstream name:** Transactions Journal - **id:** journal-entries - **name:** Journal Entries - **status:** live - **custom field support:** true - **downstream id:** sales-invoices - **downstream name:** Sales Invoices - **id:** invoices - **name:** Invoices - **status:** live - **custom field support:** true - **downstream id:** transactions-purchase - **downstream name:** Transactions Purchase - **id:** bills - **name:** Bills - **status:** live - **custom field support:** true - **downstream id:** dimensions-kpl - **downstream name:** Dimensions Kpl - **id:** tracking-categories - **name:** Tracking Categories - **status:** live - **custom field support:** true - **downstream id:** vat-codes - **downstream name:** Vat Codes - **id:** tax-rates - **name:** Tax Rates - **status:** live - **custom field support:** true - **downstream id:** bank-books - **downstream name:** Bank Books - **id:** bank-accounts - **name:** Bank Accounts - **status:** beta - **custom field support:** true - **downstream id:** bank-transactions - **downstream name:** Bank Transactions - **id:** payments - **name:** Payments - **status:** live - **custom field support:** true - **downstream id:** payments-supplier - **downstream name:** Payments Supplier - **id:** bill-payments - **name:** Bill Payments - **status:** live - **custom field support:** true - **downstream id:** dimensions-prj - **downstream name:** Dimensions Prj - **id:** projects - **name:** Projects - **status:** beta - **custom field support:** true - **downstream id:** companies-list - **downstream name:** Companies List - **id:** companies - **name:** Companies - **status:** beta - **custom field support:** false - **downstream id:** subsidiaries-list - **downstream name:** Subsidiaries List - **id:** subsidiaries - **name:** Subsidiaries - **status:** live - **custom field support:** true - **downstream id:** bank-feed-statements - **downstream name:** Bank Feed Statements - **id:** bank-feed-statements - **name:** Bank Feed Statements - **status:** beta - **custom field support:** true - **downstream id:** expenses - **downstream name:** Expenses - **id:** expenses - **name:** Expenses - **status:** live - **custom field support:** false - **downstream id:** payment-methods - **downstream name:** Payment Methods - **id:** payment-methods - **name:** Payment Methods - **status:** beta - **custom field support:** false - **downstream id:** transactions-general-ledger - **downstream name:** Transactions General Ledger - **id:** general-ledger-transactions - **name:** General Ledger Transactions - **status:** beta - **custom field support:** false - **downstream id:** journals - **downstream name:** Journals - **id:** journals - **name:** Journals - **status:** beta - **custom field support:** false - **downstream id:** fiscal-periods - **downstream name:** Fiscal Periods - **id:** fiscal-periods - **name:** Fiscal Periods - **status:** beta - **custom field support:** false - **downstream id:** trial-balance - **downstream name:** Trial Balance - **id:** trial-balance - **name:** Trial Balance - **status:** beta An omitted operation list does not establish operation support. Verify the selected operation in the coverage matrix. [API reference](https://developers.apideck.com/apis/accounting/reference.md) · [Coverage matrix](https://developers.apideck.com/apis/accounting/coverage)