




Trusted by winning dev teams
Sync data with weclapp
Unified. Reliable. Secure.
Weclapp is a cloud-based ERP system from Germany and widely used by small and mid-sized businesses (SMBs) across the DACH region. The platform combines CRM, inventory management, project management, invoicing, and accounting into a single, modular solution.
Integrate now alongside dozens other Accounting platforms with Maesn.

Instance ID handing with every API Call
The weclapp instance ID is part of the account URL and must be included in every API call. With Maesn, it is requested once during authentication and automatically reused for all requests.

Contact Relationships
Weclapp stores contacts in multiple forms, including companies, linked contact persons, and standalone records.

API Key - based Authentication
Authentication relies on user-specific API keys. With Maesn, you can offer an authentication flow that seamlessly fits your product’s design and user experience.
"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
The Maesn difference
Built faster and sell more with Maesn
Stop keeping your engineers busy with building one integration after the other. Focus on your core value: Your product.
Focus on your core product
Engineering focus
Enable your sales team to have what your leads want. Launch a portfolio of integrations in days, not quarters. Accelerate your sales.
Stop losing deals due to integrations
Sales enablement
Integrations reduce churn - dramatically. Increase your customer satisfaction with end-to-end integration to all relevant systems.
Tie your customers for ever
Higher customer retention

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Learn more about weclapp API Integration
Why companies choose Maesn
3 Reasons why it is better to integrate weclapp API with Maesn

Secure & Compliant
We have a strong relationship to weclapp. 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.

Weclapp Sandbox
We provide you with everything you need, so you can focus on what counts.
You can read and write data in weclapp related to accounts, bank accounts, bills, invoices, credit notes, booking proposals, customer and supplier data, expenses, offers, payments, transactions, balances, journals, journal entries, projects and more. Learn more about how Maesn integrates to weclapp.
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 weclapp 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.Connecting weclapp via Maesn is faster, easier to maintain and the best thing: you get immediate access to dozens of other financial and ERP systems, while saving months of engineering effort spent on handling different APIs, Webservices, individual URLs and compliance edge cases across providers.
FAQ on weclapp API Integration









