Custom Twinfield integration: automate your accounting
Appfront develops custom Twinfield integrations that seamlessly connect your cloud accounting with webshops, CRM systems, invoicing software and in-house applications. Using Twinfield's official SOAP/XML web services and REST API, we build stable integrations that eliminate manual entries, automate VAT processing and keep your financial administration in sync in real time.
What is a Twinfield integration?
Twinfield is the cloud accounting software from Wolters Kluwer, used by over 100,000 organisations in the Netherlands — from sole traders and small businesses to large accountancy firms. The platform offers modules for general ledger, accounts receivable and payable management, sales invoicing, VAT returns, project administration and fixed assets.
A Twinfield integration automatically connects that cloud accounting platform to your webshop, CRM package, invoicing software or in-house application. Invoices are posted automatically, debtors are synchronised, VAT codes are applied correctly and ledger accounts are updated in real time, with no manual input and no duplicates.
Appfront builds these integrations to measure using the official Twinfield APIs: the SOAP/XML web services for in-depth integrations and the REST API for modern applications. We align the scope, synchronisation frequency and error handling with your actual business processes, including support for Twinfield's multi-administration structure.
Real-time synchronisation
Changes in Twinfield or in the connected system are passed on immediately or according to an agreed schedule. No more overnight CSV imports, just financial data that is always up to date.
Automatic invoice processing
Sales invoices, general ledger postings and VAT codes are created and processed automatically in Twinfield. Less error-prone manual work and consistent administration across all systems.
Via official Twinfield APIs
Implementation in line with the Twinfield SOAP/XML specifications and REST API, with OAuth 2.0 authentication and structured error handling. No reverse engineering or undocumented endpoints.
Our development process for Twinfield integrations
We work to a proven methodology that removes uncertainty early and delivers a stable integration. From the initial analysis of your administration structure and data flows through to go-live and ongoing management, every step is aimed at an integration that your team can understand and trust.
We map out which Twinfield modules and administrations are relevant, which direction the data needs to flow and which booking rules and VAT logic apply.
We design the integration architecture, choose between SOAP or REST based on your use case and define an error handling and retry strategy.
Implementation with automated tests, structured logging and monitoring. You see working builds along the way and can give feedback on the data mapping.
Controlled go-live with data validation against your accounts, followed by ongoing management, monitoring and further development.
What a Twinfield integration concretely delivers
Every integration is developed specifically for your business processes. Below are the features we most often build for organisations that want to connect Twinfield with the rest of their software landscape.
Invoice transfer
Sales invoices are created automatically in Twinfield based on orders, contracts or time registrations from your source system, including the correct general ledger accounts, VAT codes and cost centres. Manual invoice booking becomes a thing of the past.
Debtors & creditors sync
Customer and supplier details are synchronised bidirectionally between Twinfield and your CRM, webshop or ERP. Newly created relationships, address changes and contact persons are up to date in both systems straight away.
General ledger postings
Journal entries and memorial postings are created automatically in the correct journal and on the correct general ledger account. Posting lines are mapped according to your chart of accounts, so your financial reporting is correct without manual adjustments.
VAT automation
VAT codes are applied automatically based on product type, customer location and transaction type. Intra-EU supplies, reverse charge rules and non-standard VAT rates are handled correctly, ready for your VAT return without rework.
Multi-administration routing
Twinfield supports multiple administrations within a single environment. Our integrations automatically route data to the correct administration based on entity, branch or business unit, which is essential for accountancy firms and holding structures.
Webshop & e-commerce
Orders, customers and payments from Magento, Shopify, WooCommerce or Lightspeed flow automatically into Twinfield as sales invoices. Revenue, VAT and debtor administration stay in sync without manual work.
Typical use cases in practice
Depending on your type of organisation, an integration with Twinfield can look very different. We regularly see a number of recurring patterns, and for each of them we have developed a working model.
Accountancy firms
Firms that manage dozens to hundreds of administrations in Twinfield connect the platform to their client portal, document management system or workflow tool. Data is routed per administration, annual accounts and tax returns are prepared efficiently, and clients gain insight through their own dashboard, with access control maintained per mandate.
E-commerce & webshops
A webshop processing dozens to hundreds of orders a day cannot run on manual entries. We connect your Magento, Shopify or WooCommerce to Twinfield so orders are automatically converted into sales invoices, including VAT logic per country, exceptional product groups and bank reconciliation. See also our API integrations.
Professional services
Consultancy firms, IT service providers and creative agencies bill on the basis of hours or project phases. An integration between your time tracking (Simplicate, TimeChimp, Harvest) and Twinfield automatically turns logged hours and project costs into sales invoices, with the correct cost centres and project codes for accurate profitability reporting.
Wholesale & distribution
Organisations running a separate WMS or stock system alongside Twinfield benefit from bidirectional synchronisation of items, purchase invoices and stock movements. Purchasing, sales and warehouse work from the same picture of reality, while financial processing in Twinfield runs fully automated.
Technology we use
We build Twinfield integrations with modern, well-maintained stacks. The precise choice depends on your situation and preferences, so your own team can manage or further develop the integration. We provide clear documentation and are happy to work alongside other suppliers.
For messages in accordance with the Dutch Taxonomy from your own system, there is our page on an SBR integration.
Why choose Appfront for your Twinfield integration?
Appfront has extensive experience building accounting and financial API integrations for a wide range of organisations in the Netherlands. We always start with a thorough analysis of your administration structure, booking rules and existing systems. An integration must not only work technically, but also add practical value to your financial workflows.
With every integration, we write clear documentation and make sure your own team, or any future supplier, can understand and manage the integration. No black box, but transparent code and clear agreements on monitoring, alerting and maintenance.
You will work with a dedicated point of contact who understands both the technical and the financial-administrative side. This keeps communication short and speeds up decisions when choices need to be made during the build about posting rules, VAT mapping or data prioritisation.
See also our wider services around API integrations, middleware, custom software development and web app development.
- Specialists in Dutch accounting and ERP integrations
- Experience with Twinfield SOAP/XML and REST APIs
- Support for multi-administration and consolidation
- Structured error handling and retry mechanisms
- Comprehensive logging and monitoring from day one
- Clear documentation your team can read and manage
- A fixed point of contact, no account managers passed around
- Ongoing maintenance and proactive further development
Security and privacy in Twinfield integrations
Financial data, debtor and creditor information fall largely under the GDPR and contain commercially sensitive information. Appfront treats every Twinfield integration with that in mind: we do not store unnecessary data, we encrypt sensitive information both in transit and at rest, and we document the data flows so that your record of processing activities stays up to date.
Authentication runs via OAuth 2.0 with limited scopes. We only request access to the Twinfield modules that the integration actually needs. We agree in advance which data is to be exchanged and minimise the scope in line with the data minimisation principle.
More on our security approach: information security policy and CVD policy.
- GDPR-compliant data processing and data minimisation
- OAuth 2.0 with limited scopes per integration
- Encryption in transit (TLS 1.2+) and at rest
- Role-based access and least-privilege principles
- Audit logs with traceable data flows
- Automatic retries and dead-letter queues
- Monitoring and alerting for anomalies
- Documentation for your record of processing activities
Frequently asked questions about Twinfield integrations
Answers to the questions we receive most often about custom integrations with Twinfield.
A Twinfield integration is a technical link that allows Twinfield, the cloud accounting software from Wolters Kluwer, to exchange data automatically with another software system. This happens via Twinfield's official SOAP/XML web services or its REST API. Think of automatically synchronising sales invoices, debtors, general ledger postings or VAT data between Twinfield and, for example, a webshop, CRM or ERP package.
A custom integration makes sense when no ready-made connector is available for your specific combination of systems, or when a standard integration does not fit your workflows well enough. Organisations with unusual booking rules, multi-administration structures or complex VAT logic often choose a custom-built solution that fits their situation exactly.
The lead time depends on the number of systems to connect, the complexity of the data flows and the desired synchronisation frequency. A one-way integration, for example pushing invoices from a webshop, can be operational within a few weeks. Bidirectional synchronisation across multiple entities and multi-administration usually takes longer. After an intake meeting, we provide a realistic timeline.
We work with Twinfield's official SOAP/XML web services and REST API, and build the integration layer using modern back-end technologies such as Node.js, Python, Laravel or .NET. Authentication runs via OAuth 2.0. For scheduling, monitoring and error handling we use tools such as job queues, webhooks and logging dashboards, depending on the requirements.
Costs depend on the complexity of the integration you need: the number of data flows, the number of administrations, how often data is synchronised and the degree of custom business logic. Ongoing management, monitoring and support also affect the investment. We always provide a transparent quote following a no-obligation review of your situation.
Yes. All integrations are developed in line with GDPR and security best practices. We encrypt data in transit and at rest, authenticate via OAuth 2.0 with limited scopes, and minimise the amount of data exchanged. The data flows are documented so that your record of processing activities remains complete.
Yes. Appfront regularly takes over existing integrations, even when they were built by another party. We start with a code and architecture review, document the integration and draw up a maintenance plan. From there, we handle adjustments, extensions and monitoring.
Yes. Twinfield is particularly strong in multi-administration, meaning multiple administrations within a single environment. Our integrations take this into account: data is routed per administration, so bookings, debtors and reports end up in the correct administration. This is especially relevant for accountancy firms and holding structures.
Ready to build your Twinfield integration?
Tell us which systems you want to connect to Twinfield and what you want to automate. We're happy to think along on the architecture and deliver a working integration that suits your financial processes. A no-obligation first conversation will give you a clear picture of the possibilities within half an hour.