Use versioning to control changes to your API Use versioning to implement new functionality and avoid breaking existing integrations. When you introduce significant functionality changes to your API, create a new version of the API first. Do not introduce behavior that will break existing integrations in a published version. Using versioning allows you to implement significant changes to your API without breaking existing clients. You can then release the new version of the API for new clients while allowing existing clients to upgrade at their own pace. Encourage clients to use a version-specific API, or configure the API without a default version to force clients to specify a version. You can also make new, optional behavior available by adding an optional parameter to an existing version.