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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.
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Requests without a valid API version will return HTTP 400 error.
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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.