You can use this API to access all Accounting API endpoints.
Base URL
The base URL for all endpoints is
https://api.maesn.dev
Data models
The following unified data models are supported in the Accounting API:
Booking proposal
A Booking proposal is a suggested accounting entry that includes all the relevant data needed for a financial transaction, such as the accounts involved, amounts, and any additional information required.
A Contact is an individual or business entity to which products and services are sold to or purchased from. The contact model contains both Customers, whom products and services are sold to, and Suppliers (or Vendors), whom products and services are purchased from. Note that it is preferred to use the Customers and Suppliers models and that contacts are only supported as an exception, for systems where a contact cannot be classied as a customer or supplier in a deterministic way.
Dimensions
A Dimension is a categorization method used to classify transactions within an accounting platform. Last modified on January 23, 2026
