2026-10-01. Every event carries it in api_version.
Kalixo makes additive changes without a new version: new endpoints, new optional
request fields, new response fields, new event types, new enum values (for example a
new decline_code or payment method type). Build your integration to ignore unknown
fields and event types.
Breaking changes (removing or renaming fields, changing meanings) ship only with a new
API version, announced in the changelog at least six months ahead.
Kalixo.js follows semantic versioning on https://js.kalixo.io/v1/. The v1 path always
serves the latest compatible release.