Most of Ayla's home server settings are defined in specific configuration files under the root directory. The settings.json is public and available at the repo, but the real deal (credentials, API keys, email rules, etc) lives under a settings.private.json
file which unfortunately I can't publish for obvious reasons. A sample of this file is available: settings.private.json.sample
The Windows Phone 8.1 phone client is not ready, so docs are not available (yet!).