Class PropertiesService

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

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