Class PropertiesService

// Sets three properties of different types.
var documentProperties = PropertiesService.getDocumentProperties();
var scriptProperties = PropertiesService.getScriptProperties();
var userProperties = PropertiesService.getUserProperties();

documentProperties.setProperty('DAYS_TO_FETCH', '5');
scriptProperties.setProperty('SERVER_URL', 'http://www.example.com/MyWeatherService/');
userProperties.setProperty('DISPLAY_UNITS', 'metric');