Production documentation

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

• Reporting data on loan contracts – API description (pdf) (updated 1 December 2025)
• Checking loan data – API description (pdf) (updated 1 December 2025)
• Requesting a credit register extract – API description (pdf) (updated 1 December 2025)

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.

• API processing rules and error codes (xls) (updated 1 December 2025)

Message examples

Also study examples of messages sent to different APIs:

• Message example content (pdf) (updated 1 December 2025)
• Message examples (zip) (updated 1 December 2025)

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.

• Schema descriptions (zip) (updated 1 December 2025)