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The latest version is 2025-11-20. Specifying API version is required to prevent breaking changes in the new versions breaking your integration. Any breaking changes will always be released in a new API version. When making an API request, add X-API-Version HTTP header with the API version you’re using. 
X-API-Version: 2025-11-20
cURL
curl -XGET -H 'Authorization: Bearer your-secret-api-key' -H 'X-API-Version: 2025-11-20' 'https://management-api.fpjs.io/hello'
Requests without a valid API version will return HTTP 400 error. Before upgrading to a new API version, you should read the Changelog to understand what breaking changes are included and to learn more about how to upgrade to a new API version.