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Specifying API version is required to prevent breaking changes in the new versions breaking your integration. Any breaking changes will always be released as 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: 2024-09-01
cURL
curl -XGET -H 'Authorization: Bearer your-secret-api-key' -H 'X-API-Version: 2024-09-01'\
  'https://drn-api.fpjs.io/drn/...'
Requests without a valid API version will return HTTP 400 error.
JSON
{
  "error": {
    "code": "version_not_found",
    "message": "version is not found"
  }
}
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 the new API version.