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With the current version of the API it is possible to store languages unknown to Umbrella Faces (example: "en" or "ru_RU"). With our next release a validation on the language will be implemented. As of then we accept by Umbrella Faces supported language codes only. There will be a new separate call available for API customers to fetch a list of supported language codes. Details and an example can be found within our Profiles on Demand API documentation: Profiles on Demand API Documentation Get language codes