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Connect Fortnox and Eijsink

Connecting Fortnox and Eijsink could enable automated data transfer between accounting and point-of-sale operations. This could reduce manual entry, support more accurate financial reporting, and improve inventory management by ensuring that transactional data flows efficiently between the two systems. Integration may also help streamline reconciliation processes and support timely business insights.

You can build this integration on the System2System platform. We design the connection between Fortnox and Eijsink around the way you work — not as an off-the-shelf connector, but to fit your systems.

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Why connect Fortnox and Eijsink?

A company operating both Fortnox and Eijsink could benefit from connecting these systems by enabling data to flow between them, reducing the need for manual data entry and ensuring that both platforms reflect the same information. Without a connection, staff may need to enter the same data twice, such as sales transactions or customer details, which can lead to errors, omissions, and time-consuming reconciliation work. Over time, records in each system could diverge, resulting in discrepancies that affect reporting, compliance, and business decision-making. Decisions based on outdated or inconsistent data could undermine operational efficiency and financial accuracy. If a connection were established, the types of data that could be exchanged would depend on the core functions of each system. For example, Fortnox is widely known as an accounting and financial management platform, while Eijsink is recognized for its point-of-sale solutions. Commonly exchanged data in such scenarios could include sales transactions, inventory levels, product catalogs, and customer details. The ability to synchronize these data points could help ensure that financial records match sales activity, that inventory counts are up to date, and that customer information is consistent across both platforms. Ultimately, the specific data that can be exchanged depends on what each system makes available through its API and must be determined for each situation.

How System2System builds an integration

Connectors

We connect to each system through the interface it offers — an API, a database, a file exchange or a webhook — and handle authentication, rate limits and retries.

Mapping

Fields rarely line up one to one. We map and transform the data so both systems receive it in the shape they expect.

Workflow

We define what triggers an exchange, in which direction data flows and which system takes precedence when the two disagree.

Monitoring

Every exchange is logged. Failures are flagged and can be replayed, so nothing disappears without anyone noticing.

What can actually be exchanged?

That depends on what Fortnox and Eijsink make available through their APIs, on the licences and modules in use, and on the version each system runs. Which records are synchronised, in which direction and how often, is something we determine together before any work starts.

We are happy to look at your specific situation and tell you what is feasible — including when the answer is that it is not.

About these systems

Read more about each system and what it can be connected to

Looking to connect these systems?

Talk to us about what your setup needs. No obligation.

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