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Production documentation

Here you can find the register’s current production documentation. The register is continuously being developed, and future changes can be found on the Upcoming changes page.

Separate second-stage documentation is no longer available. The second-stage documentation was incorporated into the production documentation on 1 December 2025.

API descriptions

API descriptions describe the data content to be reported and the structure of the message to be sent to the API and the response message returned from the API.

API processing rules and error codes

This document is a detailed description of the processing rules of each item of data reported to the register and of the error codes that the API shows in different error situations.

Message examples

Also study examples of messages sent to different APIs:

Schema descriptions

Schema descriptions describe the structure and content of different messages, and uncomplicated rules regarding required/optional data. The descriptions do not contain rules regarding data fields’ conditionally required data, nor more complicated validations related to the system’s data content. These can be found in API descriptions.

Page last updated 4/1/2026