Connect Fortnox and Square

Connecting Fortnox and Square for a company would involve enabling the transfer of financial or sales data between the two platforms. Such a connection could support automated bookkeeping, streamlined reconciliation of transactions, and improved reporting by ensuring that sales and payment information from Square is accurately reflected in Fortnox’s accounting environment.

You can build this integration on the System2System platform. We design the connection between Fortnox and Square 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 Square?

A company that operates both Fortnox and Square could benefit from connecting these systems to enable more accurate and timely data flow between financial management and point-of-sale operations. Without a connection, staff may need to enter sales, inventory, and customer data into both systems separately, which increases the risk of errors, inconsistent records, and delays in updating financial figures. This lack of synchronization can result in discrepancies between sales reported at the point of sale and those reflected in accounting, making it harder to track business performance and make informed decisions. Common types of data that could be exchanged between systems of these kinds include sales transactions, payment records, inventory updates, and customer information. The exact data that can be exchanged depends on the capabilities each system exposes through its API and is determined on a case-by-case basis.

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 Square 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.