DATEV Rechnungswesen API Integration
Maesn is the only Unified API officially certified by DATEV, that enables you broad access to DATEV Rechnungswesen and DATEV Unternehmen Online with two-way-sync capabilities.
DATEV Rechnungswesen is the professional accounting software by DATEV, used by tax advisors and larger companies with in-house bookkeeping to process, manage and book financial data.
DATEV Interface Partner
Have a Certified DATEV
Integration in Hours
Certified & Compliant
Get a DATEV certified integration via Maesn. Our API is continuously tested, secured and maintained.
Post & Pull data
Post and Pull data via our REST API and forget about CSV/XML and services.
DATEV Sandboxes
We provide DATEV sandboxes, enabling you to fully focus on you product.
REST API only
Forget about XML, CSV, and special DATEV formats. You only work with an easy REST API.
DATEV integration in days: How Rally (YC25) launched faster with Maesn
Rally is a financial platform for businesses that operate vehicle fleets.
"Maesn transformed the way how to integrate with DATEV. What would have been a complex long process turned into a smooth, intuitive process thanks to their REST API, DATEV sandbox and certification process. There are simply just upsides."
Thiago Peres
CTO @ getrally.com
One API for your DATEV Rechnungswesen integration use cases.
Unified. Certified. Production-ready.
Post invoices, bills and credit notes directly into DATEV.
Push structured invoice, bill, and credit note data — including attachments — directly into your users' DATEV environment. No manual uploads, no format conversion, no back-and-forth with the tax advisor.
Invoices, bills & credit notes with attachments
Structured data in the correct DATEV format
Direct posting into the user's DATEV environment
Post journal entries directly into DATEV Rechnungswesen.
Maesn translates your standard debit and credit logic into the correct DATEV format and booking structure — reliably, in the background. You work with the same Common Data Model as every other system.
Standard debit & credit logic
Reliable translation into DATEV booking format
Same Common Data Model as every other system
Keep customer & supplier master data in sync with DATEV Rechnungswesen.
Create and update customer and supplier records directly in DATEV Rechnungswesen — so accounting master data stays accurate and in sync with your product at all times.
Create & update customers and suppliers
Master data always in sync with DATEV
Same unified API as every other system
Pull journal entries directly from DATEV Rechnungswesen.
Retrieve complete journal entry data from DATEV Rechnungswesen — including debit and credit details, cost centers, tax information, and references. Everything you need for reconciliation, reporting, and downstream workflows, through one unified API call.
Full journal entry data including cost centers & tax
Enables reconciliation & reporting workflows
Same unified API as every other system
No DATEV formats. Just a clean REST API.
Forget about XML, CSV, DATEV-specific formats — maesn handles all the conversion in the background. You work with a straightforward REST API and maesn takes care of the rest.
No XML, CSV or DATEV-specific formats
Simple REST API — one standard for all systems
Format conversion handled by maesn
Get listed in the DATEV Marketplace — supported by maesn.
A DATEV Marketplace listing requires > 25 active connections, customer interviews and a strategic fit with DATEV. Maesn supports you through the entire process and your integration via Maesn counts exactly the same as a direct integration.
Marketplace listing fully supported via Maesn
Evaluation by DATEV partner team
Maesn guides you through the qualification process
DATEV is a collection of systems, modules and webservices.
Maesn covers them all.
DATEV consists of multiple systems, modules, and web services — each with its own formats and protocols.
Maesn abstracts all of it into one unified REST API, so you never have to deal with XML, CSV, or DATEV-specific formats directly.
Document Uploads
Belegbilderservice
Upload of bills, invoices or credit notes as PDF or JPG into DATEV.
Post Structured Data
Rechnungs-datenservice 1.0
Post structured data related to invoices, bills and credit notes
Post Journal entries
Buchungs-datenservice
Post reconciled journal entries to the accounting system.
Pull Journal Entries
Export Rechnungswesen
Pull journal entries with related data directly out of DATEV Rechnungswesen.
Whitepaper Learn everything about DATEV
Understand the difference between Unternehmen Online and Rechnungswesen, how specific use cases map to required webservices, how service activation works, and which data formats matter - and why none of this complexity matters when you use Maesn.
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Get officially certified DATEV
integration via Maesn
Stop struggling with your own CSV/XML/DATEV APIs – Get a certified
DATEV integration with Maesn’s whitelabel process in days.
3 Reasons why it is better to integrate DATEV API with Maesn
Save months of effort
No need to understand DATEV complexity yourself. Maesn removes months of learning and implementation effort.
Save thousands of euros
Avoid costly clarification rounds, external support, and repeated coordination before going live.
Work with a proven partner
Maesn powers DATEV integrations trusted by thousands of companies, we know what works.
Read more in our related blog articles.
Everything you need to know about DATEV Rechnungswesen
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Frequently asked
questions
You have more questions? We are looking forward hearing from you - book a meeting now!
What is DATEV Rechnungswesen?
DATEV Rechnungswesen is the professional accounting software by DATEV, used by tax advisors and larger companies with in-house bookkeeping to process, manage, and book financial data.
What is the difference between DATEV Unternehmen Online and DATEV Rechnungswesen?
DATEV Unternehmen Online is used by businesses to upload and share financial documents with their tax advisor. DATEV Rechnungswesen is the accounting system used by the tax advisor themselves or by companies doing their own bookkeeping to process and book those documents. maesn supports both — through one unified API.
What can I build with DATEV Rechnungswesen via Maesn?
Maesn supports three core workflows for DATEV Rechnungswesen: posting journal entries, creating and updating customer and supplier master data, and retrieving journal entries including debit/credit details, cost centers, and tax information.
How do I get a DATEV sandbox for development?
Maesn provides all customers with a ready-to-use test environment for both DATEV Unternehmen Online and DATEV Rechnungswesen — so you can start building immediately without any dependencies.
Can I get listed in the DATEV Marketplace through Maesn?
Yes, an integration via maesn counts the same as a direct integration for DATEV Marketplace qualification. maesn supports you through the full process, including the 25-connection requirement and strategic fit evaluation.
Is it possible to pull data from DATEV?
Yes, via Maesn. DATEV Rechnungswesen data retrieval is available, allowing you to pull journal entries and related data directly out of DATEV through Maesn's unified API.
Does Maesn support multi-company setups for DATEV Rechnungswesen?
Yes, Maesn supports multi-company setups with strict environment isolation per company, built for enterprise-grade compliance and security.
We are European.
Enterprise-grade security & compliance are our foundation.
Built and hosted in Germany to meet the highest security and compliance standards, Maesn processes API calls in real time without storing customer data and is fully ISO 27001 & GDPR compliant.
