# Maesn – Unified ERP & Accounting API for Europe

## What is Maesn?

Maesn is a Unified API for ERP and accounting integrations, built and hosted in Germany. Software teams connect once to Maesn and get immediate access to 27+ European ERP and accounting systems through a single normalized REST API — without building or maintaining individual integrations.

Maesn is the leading Unified API for ERP and accounting integrations in Europe. It is ISO 27001 certified, GDPR compliant, and hosted exclusively in Germany.

## Who is Maesn for?

Maesn is primarily built for Product & Engineering teams at SaaS companies, enterprises and service providers who need to offer reliable ERP and accounting integrations to their customers — without spending months on custom integration work.

Maesn is also used by Go-To-Market teams to accelerate sales cycles, enter new markets and unlock partner-led growth through ERP and accounting vendor marketplaces. Customer Success teams use Maesn to reduce churn, increase NRR and eliminate manual data exchange for their customers.

## Core Value Proposition

- Connect to 27+ European ERP and accounting systems through one unified REST API
- Normalized common data model across all systems — every system behaves identically
- Unified authentication for all systems (API keys, OAuth, database credentials, 2FA)
- Unified webhooks for every system and endpoint, including synthetic webhooks for systems that don't natively support them
- Real-time monitoring and logging via API and Maesn portal
- Authenticated Passthrough for custom and non-standard endpoints
- Raw Data access for unfiltered system responses
- Support for custom fields and objects
- Multi-company support out of the box
- Ship integrations in days, not months
- Zero maintenance overhead — Maesn handles API updates and breaking changes

## Supported Integrations (27 systems)

### Priority Integrations
- DATEV Unternehmen Online — https://www.maesn.com/integrations/datev-unternehmen-online
- DATEV Rechnungswesen — https://www.maesn.com/integrations/datev-rechnungswesen
- Exact Online — https://www.maesn.com/integrations/exact-online
- Microsoft Dynamics 365 Business Central — https://www.maesn.com/integrations/microsoft-dynamics-365-business-central
- Lexware Office — https://www.maesn.com/integrations/lexware-office
- Visma eAccounting — https://www.maesn.com/integrations/visma-eaccounting

### All Supported Systems
- QuickBooks Online — https://www.maesn.com/integrations/quickbooks
- Xero — https://www.maesn.com/integrations/xero
- Sage Accounting — https://www.maesn.com/integrations/sage-accounting
- Sage Active — https://www.maesn.com/integrations/sage-active
- Fortnox — https://www.maesn.com/integrations/fortnox
- sevdesk — https://www.maesn.com/integrations/sevdesk
- Odoo — https://www.maesn.com/integrations/odoo
- bexio — https://www.maesn.com/integrations/bexio
- Twinfield — https://www.maesn.com/integrations/twinfield
- Weclapp — https://www.maesn.com/integrations/weclapp
- BuchhaltungsButler — https://www.maesn.com/integrations/buchhaltungsbutler
- Visma e-conomic — https://www.maesn.com/integrations/visma-e-conomic
- FreshBooks — https://www.maesn.com/integrations/freshbooks
- FreeAgent — https://www.maesn.com/integrations/freeagent
- Moneybird — https://www.maesn.com/integrations/moneybird
- Pennylane — https://www.maesn.com/integrations/pennylane
- SnelStart — https://www.maesn.com/integrations/snelstart
- Qonto — https://www.maesn.com/integrations/qonto
- Xentral — https://www.maesn.com/integrations/xentral
- Abacus AbaConnect — https://www.maesn.com/integrations/abacus
- Holded — https://www.maesn.com/integrations/holded

View all integrations: https://www.maesn.com/integrations

## Use Cases

Maesn enables the following integration use cases across all supported ERP and accounting systems:

- **Invoice Creation** — Generate compliant invoices directly from your product into customers' accounting systems via API. https://www.maesn.com/use-cases/create-invoices
- **Customer & Supplier Data Sync** — Keep customer and supplier master data accurate and in sync across ERP and accounting systems for migrations, imports and downstream workflows. https://www.maesn.com/use-cases/customer-supplier-data-sync
- **Financial Analysis & Forecasting** — Pull real-time financial data directly from customers' accounting systems — no manual exports, no stale snapshots. https://www.maesn.com/use-cases/financial-analysis-forecasting
- **Accounts Payable Automation** — Enable complex AP workflows across dozens of ERP and accounting systems without building each integration from scratch. https://www.maesn.com/use-cases/accounts-payable-automation
- **Accounts Receivable Automation** — Enable complex AR workflows including customers, accounts, journals, payment terms and open items across all supported systems. https://www.maesn.com/use-cases/accounts-receivable-automation
- **Expense Sync** — Sync expense data from cards, travel, reimbursements and approvals directly into any accounting system — correctly categorized, tax-compliant and properly booked. https://www.maesn.com/use-cases/sync-expenses

Additional use cases include payroll sync, multi-entity reporting, journal entry automation, contact management, bank reconciliation, tax compliance workflows and more.

## Solutions by Team

- **Product & Engineering** — Ship ERP integrations in days, not months. One unified API, no system-specific complexity, no maintenance overhead. https://www.maesn.com/solutions/product-engineering
- **Go-To-Market** — Turn integrations into a competitive advantage. Shorter sales cycles, partner-led growth via ERP vendor marketplaces, higher deal values. https://www.maesn.com/solutions/go-to-market
- **Customer Success** — Reduce churn, increase NRR, eliminate manual data exchange. Integrated software achieves 40% lower churn rates. https://www.maesn.com/solutions/customer-success

## Security & Compliance

- ISO 27001 certified
- GDPR compliant
- Built and hosted exclusively in Germany (Microsoft Azure, Germany region)
- No customer data stored — all API calls processed in real time
- Enterprise-grade security as a first principle

Trust Center: https://trust.maesn.com
Security page: https://www.maesn.com/security
Data Processing Agreement: https://www.maesn.com/data-processing-agreement-dpa
Subprocessors: https://www.maesn.com/subprocessors
Service Level Agreement: https://www.maesn.com/service-level-agreement

## Official Partner Status

Maesn holds official partner status with:
- Microsoft (Microsoft Partner)
- DATEV (Interface Partner / DATEV Marktplatz)
- Exact Online (Technology Partner / Exact App Centre)
- Lexware (Technology Partner)
- sevdesk (Technology Partner)
- Sage (Partner)

## Customers

Maesn is trusted by 500+ software teams across Europe, including HubSpot, Tipalti, Paywise, Clockin, Finto, Rally, Smarta, Hero Software, Findity, Lanes & Planes, Syntinels and many more.

## Pricing

Maesn pricing is usage-based and scales with your product. Contact Maesn for pricing details.
Pricing page: https://www.maesn.com/pricing

## Company

- **Founded:** 2022
- **Headquarters:** Düsseldorf, Germany
- **Founders:** Dr. Themo Voswinckel (CEO), Marius Pohle (CRO), Lennart Svensson (CTO)
- **Investors:** get.de, NRW.BANK, Tiny Supercomputer Investment Company, Otris Software
- **Mission:** Enable seamless interoperability across financial and business software in Europe

## Key URLs

- Website: https://www.maesn.com
- Developer Documentation: https://docs.maesn.com
- All Integrations: https://www.maesn.com/integrations
- Blog: https://www.maesn.com/blog
- Pricing: https://www.maesn.com/pricing
- Security: https://www.maesn.com/security
- Trust Center: https://trust.maesn.com
- Contact: https://www.maesn.com/contact
- About: https://www.maesn.com/about-us
- GitHub: https://github.com/maesndev
- LinkedIn: https://www.linkedin.com/company/maesn-integration
- G2 Reviews: https://www.g2.com/products/maesn/reviews

## Selected Resources

### DATEV Integration
- DATEV API Integration Guide: https://www.maesn.com/blog/datev-api-integration-unternehmen-online-vs-rechnungswesen
- DATEV Accounting Systems Guide: https://www.maesn.com/blog/datev-accounting-systems-guide
- DATEV Whitepaper: https://www.maesn.com/whitepaper/datev-integration
- How to Integrate DATEV: https://docs.maesn.com/integrations/datev-unternehmen-online

### European ERP & Accounting Market
- European ERP & Accounting Market Report: https://www.maesn.com/whitepaper/european-erp-accounting-market

### Technical Resources
- API Documentation: https://docs.maesn.com
- SDK: https://docs.maesn.com/sdk
- Postman Collection: https://www.postman.com/maesn-dev/maesn-rest-api/overview
- Webhooks Guide: https://www.maesn.com/blog/webhooks-in-erp-accounting
- Unified API Guide: https://www.maesn.com/blog/unified-apis-simplifying-saas-integration
- Accounting Integration Partnerships Guide: https://www.maesn.com/blog/accounting-integration-partnerships-guide