We advise against using APIs that are not officially documented on learn.fotoware.com. This goes for all undocumented API endpoints, usage or behavior.
Behavior of undocumented APIs is subject to change, which may break your integration in the future. We strongly discourage building integrations that depend on undocumented aspects of a specific version of FotoWeb, as this can make customers reluctant to update to newer versions and get the latest security patches and bugfixes.
If you're wondering how to build a certain integration, you should reach out to FotoWare Support and give us a detailed description of what you want to do, so we can find a solution and maybe a way to improve our APIs.