Suomi.fi for Service Developers
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Web API and selection interface

The Web API provides a selection interface through which you can choose the objects for acting on behalf of another party, that is, the persons related to the granting of the mandates. The Web API also offers REST query interfaces that are for queries on the right to use the service, in other words, to check that the person has the right to act on behalf of the other person.

REST / JSON interfaces, which are protected with API Key or OAuth2 + +API Key authentication, are used for calling the interface.

The e-service needs the information shown below to call Suomi.fi e-Authorizations. When registering an e-service, the Digital and Population Data Services Agency provides the organisation with a Web API Client ID, API Key and Oauth password.

  • Web API Client ID: Eight-digit alphanumeric identifier
  • API Key: string
  • Oauth password: OAuth password

If the Web API session has expired, the API will return an HTTP 401 response.


Updated: 2/3/2026

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