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Sync data with bexio
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Bexio is a leading Swiss cloud accounting software widely used by SMEs and fiduciaries across Switzerland. The platform supports core financial processes such as invoicing, VAT reporting (including Swiss “Bezugssteuer”), payroll, bank reconciliation, and compliant bookkeeping aligned with Swiss tax regulations.
Integrate bexio alongside dozens of other accounting and ERP systems through the Maesn Unified API.
ID-Based Data Model: Nothing Works Without Internal IDs
In bexio, you don’t send values - you send IDs. Contacts, VAT codes, accounts, and even basic references require internal numeric identifiers, which means lookup calls, caching, and mapping logic before anything works reliably. Many teams underestimate this and end up building brittle reference-sync layers. Maesn abstracts this completely and and we handle ID resolution per tenant in the background.
Swiss VAT & “Bezugssteuer”
Switzerland is outside the EU VAT system. Reverse charge is handled as Bezugssteuer with tenant-specific VAT codes and strict validation rules. The wrong VAT–account combination will fail. Maesn translates tax intent into the correct Swiss VAT configuration, so you don’t embed country-specific tax branches in your core product.
OAuth + OpenID Connect Auth
For API access, bexio requires OAuth 2.0 with secure token storage and refresh handling. For Marketplace listing, OpenID Connect (OIDC) is mandatory on top. Maesn centralizes authentication across accounting systems, so you only integrate once to Maesn.
"Adding Qonto to our existing integrations was a piece of cake with Maesn. It is a game changer for our customers with all the integration cababilites!"
Juri Preis
CEO @ Smarta
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Learn more about bexio API Integration
Why companies choose Maesn
3 Reasons why it is better to integrate bexio API with Maesn
Secure & Compliant
We have a strong relationship to bexio. This ensures that the Maesn API is always up-to-date and any maintenance is covered on our end.
Common Data Model
We provide a clean, unified data model that abstracts away system-specific quirks, so teams can build reliable integrations without dealing with ERP-specific complexity or workaround-heavy implementations.
Bexio Sandbox
We provide you with everything you need, so you can focus on what counts.
The bexio API is well documented, but integration can become complex due to internal ID mapping, tenant-specific VAT configuration (Bezugssteuer), strict invoice lifecycle rules, and OAuth + OpenID Connect requirements for Marketplace listing.
Maesn simplifies this by abstracting IDs, tax logic, lifecycle handling, and authentication into one unified API, so you can integrate bexio without embedding Swiss-specific complexity into your product.
In comparison to other Unified API vendors, you can always sync data when you want with Maesn. This can be done in real-time using webhooks or in your favorite interval like hourly, daily, weekly etc.
If a request fails, Maesn automatically responds with a corresponding error code. Further information can be found here.
You can monitor the status of your requests and resolve any errors using the Maesn Dashboard, which provides real-time observability and logs for better issue detection.
Setting up a bexio integration from scratch through Maesn typically takes anywhere from a few days to a few weeks, based on the complexity of your use-cases. The greatest thing is, once the integration is implemented, you can access more than a dozen additional accounting integrations, including DATEV, Exact Online, Qonto and Sage.
Maesn uses HTTPS for all data transfer. All connections are secured using TLS with industry-standard, state-of-the-art encryption.
We don't store any of your customer data at Maesn to be 100% GDPR compliant - our platform is hosted at Microsoft Azure in Frankfurt, Germany.Direct integration means handling internal ID mapping, Swiss VAT logic (Bezugssteuer), invoice lifecycle constraints, and OAuth + OpenID Connect yourself. This tightly couples your product to Swiss accounting specifics.
Maesn abstracts these complexities into one unified API, so you integrate bexio once — and automatically stay scalable across 30+ accounting systems without rewriting your integration logic.
Typical challenges include resolving internal IDs before creating objects, handling Swiss VAT logic (including Bezugssteuer), respecting strict invoice states, and managing OAuth plus OpenID Connect for Marketplace listing.
Maesn abstracts these complexities, so you can integrate bexio without embedding Swiss-specific accounting logic into your product.
Frequently Asked Questions About Bexio API Integration
