Lexware Office API Integration
Lexware Office is a cloud accounting platform widely used by SMEs, freelancers and accounting firms in Germany. It covers invoicing, expense tracking, contacts and tax reporting. The public API is available on the XL plan only. Deeper accounting functionality requires Partner API access, which involves a bilateral qualification process with the Lexware team.
Integrate Lexware Office alongside dozens of other accounting and ERP systems through Maesn Unified API.
Technology Partner
Have a Lexware Office integration
in days
Unified authentication flow
Lexware Office uses API key authentication. No OAuth setup, no app registration. Integrate headless or via Maesn connect.
Webhooks included.
Lexware Office supports native webhooks. Maesn extends these with synthetic webhooks for every object.
One integration, every system.
Once Lexware Office is live, every other accounting and ERP system Maesn supports is immediately accessible.
How Clockin Got 800+ Integration-Driven Inbound Leads in 2 Weeks
Clockin helps small and mid-sized businesses digitize time tracking. From work hours to project times. User log everything via app or terminal, even offline, eliminating paper-based processes entirely.
"We use Maesn to successfully leverage integrations and partnerships as a key driver for lead generation and expansion into new markets and customer segments. By connecting Clockin to our customers' accounting systems, project data flows directly into their existing tools, ensuring a smooth, reliable data exchange with the systems they already use."
Fabian Ebbert
CSO @ Clockin
One API for Lexware Office and every system that comes after.
Unified. Certified. Production-ready.
Post and pull all Lexware Office data.
Sync invoices, bills, credit notes, customers, suppliers, payments, and more between your product and Lexware Office through one unified API call.
Invoices, bills and credit notes with line items
Customers, suppliers and payment data
Same unified API as every other system
Webhooks for every object.
Lexware Office supports native webhooks for customers, suppliers, items, invoices, and payments. Maesn creates user-based subscriptions per customer, with normalized payloads consistent across all systems. Including a token revocation event to handle access changes in real time.
Customers, suppliers, items, invoices and all you need
User-based subscriptions per customer
Token revocation event supported
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Start your Lexware Office API integration today.
The Maesn docs cover every Lexware Office endpoint, authentication flow and implementation detail. Plus a full overview of the current coverage, which is continuously being expanded.
Full Lexware Office documentation
Current coverage overview at a glance
Continuously expanding endpoints & integrations
Get Lexware Office partner
and listed on Lexware website with Maesn
Get your product listed in the Lexware Office marketplace and enable companies on lower plans to use your integration.
Benefit from a large audience and strong co-marketing activities.
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3 Reasons why Lexware Office API integration is better with Maesn
Unified auth, your way.
Authenticate users via a branded Maesn Connect popup in your own CI, or headless. Fully programmatic, without any UI interaction.
Token revocation, handled.
Lexware Office notifies Maesn when a user revokes access. Your system stays in sync automatically, with no manual handling required.
One integration, every system.
Once Lexware Office is live, every other system Maesn supports is immediately accessible.
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.
Read more in our related blog articles.
Everything you need to know about Lexware Office API Integration
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Frequently asked
questions
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What is Lexware Office or Lexoffice?
Lexware Office (formerly Lexoffice) is one of the most widely used accounting platforms among German SMBs, offering tools for invoicing, bookkeeping, expense management and more.
Why should I integrate Lexware Office via Maesn instead of directly?
Integrating via Maesn is faster, easier to maintain, and gives you immediate access to dozens of other accounting and ERP systems. Maesn handles authentication, webhooks, and all Lexware Office-specific implementation details in the background.
How does Lexware Office authentication work with Maesn?
Lexware Office uses API key authentication. Maesn supports two flows: a branded authentication popup via Maesn Connect in your own CI, or a fully headless flow for programmatic authentication without any UI interaction.
Does Lexware Office support webhooks?
Yes. Lexware Office supports native webhooks for customers, suppliers, items, invoices, and payments. Maesn creates user-based subscriptions per customer with normalized payloads, consistent with every other system.
What is the token revocation webhook?
Lexware Office sends a special webhook event when a user revokes API access. Maesn forwards this event to your system so you can handle access changes in real time, without manual intervention.
What data can I sync with Lexware Office via Maesn?
Maesn supports invoices, bills, credit notes, customers, suppliers, payments, contacts, and more. Coverage is continuously expanding and endpoints can be added on demand.
Can I get listed in the Lexware Office marketplace?
Yes. Maesn supports all three listing levels. You can start unlisted, get listed as a partner on the Lexware website, or go fully listed in the software itself. The in-software listing switches authentication from API key to OAuth — fully supported by Maesn — and removes the requirement for your users to have a Lexware XL plan, opening your integration to the full Lexware customer base.
What happens if a Lexware Office API request fails?
Maesn automatically returns a corresponding error code. You can monitor the status of all requests and resolve errors in real time via the Maesn portal, which provides full request and response logs.
How is my customers' data handled and stored?
Maesn uses HTTPS and TLS for all data transfer and does not store any customer data. The platform is hosted on Microsoft Azure in Frankfurt, Germany, and is fully GDPR compliant.