Custom Minox integration development
Appfront builds custom Minox integrations that automate your bookkeeping, whether from your own application, invoicing tool or industry software. Using Minox's modern RESTful API, secured with OAuth 2.0, we synchronise sales invoices, contacts, the general ledger and VAT data. You save hours of manual data entry and keep your firm's or company's accounts up to date at all times.
What is a Minox integration?
Minox is Dutch online accounting software for small and medium-sized businesses and their accountants. In addition to professional bookkeeping, it offers invoicing, VAT returns, automated booking of purchases, sales and bank transactions, scanning and recognition of receipts and supplier invoices, and more than eighty reports. Minox serves some seven hundred accountancy and bookkeeping firms, as well as thousands of business owners.
A custom Minox integration means, in practice: automatically posting sales invoices from your own system into the Minox ledger, keeping customer and contact records in sync, reading general ledger and VAT data for reporting, and aligning the scan-and-recognise process for purchase invoices with your workflow. This removes the manual re-keying between systems.
Appfront builds on Minox's modern RESTful API and the OWASP ASVS security standard. We align authorisation, posting logic and error handling with your actual accounting process. You can read more about the interface in the official Minox interface documentation.
RESTful API with OAuth 2.0
Minox offers a modern RESTful API, secured via OAuth 2.0. The integration identifies itself, and the main user explicitly grants permission for access to specific data. A secure foundation for any integration.
Automatic booking
Sales invoices, purchases and bank transactions are posted automatically to the right entries, rather than being retyped by hand. Data from your own system flows directly into the Minox ledger, consistently and without duplicate work.
Up-to-date bookkeeping
Because invoices and contacts sync in real time, the office always works with current figures. Accountant and business owner look at the same ledger, which makes reconciliation and period closing easier.
Our development process for Minox integrations
We work to a proven methodology that removes uncertainty early and delivers a stable integration. From an initial analysis of your accounting process and the data flows you need, through to go-live and ongoing management, every step is designed to produce an integration your team can understand and trust.
We map out which data you want to synchronise — sales invoices, contacts, general ledger or VAT — from which source system, in which direction, and with what posting logic the ledger should be populated.
We design the integration architecture, choose the right authentication and draw up an error-handling strategy.
Implementation with automated tests, structured logging and monitoring. You see working builds along the way.
Controlled go-live with data validation and a safety net, followed by ongoing management and further development.
What a Minox integration delivers in practice
Every Minox integration is set up specifically for your accounting process and the systems around it. Below are the features we most often deliver for accountants, bookkeeping firms and SMEs that use Minox as their accounting package.
Minox API and authentication
We set up the connection to Minox's RESTful API using OAuth 2.0, with explicit consent from the main user and scoped access to exactly the data that is needed. We handle token management, renewal and error handling properly, so the integration keeps running reliably.
Sales invoice synchronisation
We automatically post sales invoices from your invoicing tool, webshop or industry software into the correct Minox ledger. This includes invoice lines, VAT codes and mapping to the right general ledger account, so the books are correct straight away.
Contacts and customer data
We keep debtors, creditors and customer details in sync between your system and Minox. New contacts and changes flow through automatically, so you don't have to update the same address or VAT number in two places.
General ledger and VAT
We read general ledger movements and VAT data for reporting in your own dashboards, or we post movements to Minox in a structured way. We align with your chart of accounts, so figures remain consistent and verifiable.
Scan and recognise for purchasing
We connect the scan-and-recognise process for receipts and purchase invoices to your workflow: you upload documents, check the recognised data and have the purchase entry land in Minox. Less manual work, fewer chances of typing errors.
Accountant and office workflow
For accountancy and bookkeeping firms, we tailor the integration to working with multiple client ledgers: processing data per client file, status overviews in your own tooling, and alerts when a posting needs attention.
Typical use cases in practice
A Minox integration looks quite different from one organisation to the next. We see a number of recurring patterns, and for each we have a working setup that pays close attention to authorisation, posting logic and fitting into your existing accounting.
Accountancy firms
Accountancy firms that maintain client ledgers in Minox and want to connect data from their own tooling or tax software. Entries, contacts and VAT flow automatically into the right file, saving manual work per client. See also our API integrations.
Accountancy firms
Bookkeeping firms that manage accounts for multiple business owners and want to connect their own workflow or timesheet tools to Minox. Sales invoices and purchase documents land automatically in the correct ledger, with scan and recognise for incoming post.
SMEs with their own software
Small and medium-sized businesses with a webshop, scheduling system or industry application who don't want to retype their revenue by hand. Sales invoices and customer data sync automatically to Minox, so the bookkeeping is always current and the accountant works with the right figures.
Freelancers and small business owners
Freelancers and small business owners who invoice from their own tool or time-tracking system and prepare their VAT return in Minox. Invoices and hours flow automatically into the bookkeeping, so you have more time for your work and less for the books.
Technology we use
We build Minox integrations using the official RESTful API and OAuth 2.0, combined with the backend stack that suits you. The precise choice depends on your source systems and the data flows you need, so your own team can manage or further develop the implementation.
Why choose Appfront for your Minox integration?
Appfront has extensive experience building API integrations for a wide range of organisations in the Netherlands. We always start with a thorough analysis of your existing systems and processes. An integration should not only work technically, but also add practical value to the way you work.
For every integration, we write clear documentation and make sure your own team, or any future supplier, can understand and manage it. No black box, just transparent code and clear agreements on monitoring, alerting and maintenance.
You work with a dedicated point of contact who understands both the technical and the functional side. This keeps communication short, prevents misunderstandings and speeds up decisions when choices need to be made during development.
See also our broader services around API integrations, middleware, custom software and web app development. You can find an overview of all integrations on our integrations page.
- Experience with the Minox RESTful API and OAuth 2.0 authorisation
- Specialists in integrations between accounting and your own software
- Familiar with sales invoices, contacts, general ledger and VAT
- Secure by default: token rotation, scoped permissions, secure vaults
- 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
- A way of working tailored to your existing administrative landscape
Security and privacy in Minox integrations
Bookkeeping always contains personal data and financial information: names, addresses, VAT numbers, bank details and turnover figures. Appfront builds to the OWASP ASVS. This means, among other things: tokens in secure vaults, scoped OAuth permissions, encryption in transit and regular audits of the data flows between your system and Minox.
Minox secures the API itself with OAuth 2.0 and a two-level authorisation model: the integration identifies itself, and the main user explicitly grants permission before an integration can access parts of the administration. We document which data is exchanged and why, so your record of processing activities is complete and you can demonstrate compliance with GDPR.
More on our security approach: information security policy and CVD policy.
- GDPR-compliant data processing and data minimisation
- 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
- Secrets management in line with best practice
- Documentation for your record of processing activities
Frequently asked questions about Minox integrations
Answers to the questions we get asked most often about Minox integrations.
A Minox integration is a technical link between Minox Online and another system, such as your own application, an invoicing tool, industry software or time registration. Using Minox's modern RESTful API, secured with OAuth 2.0, data such as sales invoices, customer records, general ledger entries and VAT details is exchanged programmatically. The integration can be simple (automatically posting invoices to the accounts) or extensive (full synchronisation of customers, general ledger and VAT for an accountancy firm).
A Minox integration suits accountancy and bookkeeping firms, and SMEs that use Minox as their accounting package and want to avoid re-keying data by hand. If you manage invoices, customer records or time registration in another system and want them to land in Minox automatically, an API integration will help. If you don't yet use Minox or are unsure how it fits your way of working, we'll work out together which set-up suits you best.
A simple integration, such as automatically posting sales invoices from one system into Minox, can go live within a few weeks. More extensive scenarios involving synchronisation of customers, general ledger and VAT data, and processing scan and recognition tasks, usually take longer. After an intake meeting in which we review your administration and the data flows you need, we'll give you a realistic estimate.
We work with Minox's official RESTful API and authentication via OAuth 2.0, combined with the backend stack that suits you: Node.js, Python, PHP, .NET, Ruby or Go. Minox uses a two-level security model: the integration identifies itself, and the main user explicitly grants permission for access to specific data. We build around that authorisation, with sound error handling and logging.
The cost is determined by the complexity of the data flows, the number of systems to connect, the required synchronisation frequency and the amount of custom work in the booking logic. Ongoing management, monitoring and support also affect the total investment. We always provide a clear quote after a no-obligation analysis of your situation.
Yes. Minox secures the API with OAuth 2.0 and a two-level authorisation model, in which the main user explicitly grants permission before an integration can access parts of the administration. Appfront builds to the OWASP ASVS: tokens stored in secure vaults, scoped permissions, encryption in transit and strictly separated rights per integration. Because accounting data contains personal and financial information, we document the data flows so your record of processing activities stays complete and you can demonstrate GDPR compliance.
Yes. Appfront regularly takes over existing integrations, even where they were originally set up by another party. We review the API integration, the authorisation, the booking logic and the error handling, document the current set-up and propose improvements. From then on we can handle changes, extensions and monitoring, including timely rotation of tokens and keys.
Minox serves some 700 accountancy and bookkeeping firms and thousands of business owners. An integration with Minox therefore suits accountancy firms that want to process client ledgers more efficiently, bookkeeping firms that want to connect their own tools, and SMEs and freelancers who want invoicing or time registration to flow into Minox automatically. For each situation, we look at which data flows will save the most manual work.
Ready to build your Minox integration?
Tell us which data you want to synchronise and from which system Minox should be fed. We are happy to think along about sales invoices, contacts, the general ledger, VAT and scan and recognise. A no-obligation first conversation will give you a clear picture of the possibilities within half an hour.