var getAccessToken = function {

return new Promise(function(resolve, reject) {

var url = 'https://login.microsoftonline.com/common/oauth2/token';

var username = // Username of PowerBI "pro" account - stored in config
var password = // Password of PowerBI "pro" account - stored in config
var clientId = // Applicaton ID of app registered via Azure Active Directory - stored in config

var headers = {
  'Content-Type' : 'application/x-www-form-urlencoded'
};

var formData = {
  grant_type:'password',
  client_id: clientId,
  resource:'https://analysis.windows.net/powerbi/api',
  scope:'openid',
  username:username,
  password:password
};

request.post({
  url:url,
  form:formData,
  headers:headers

}, function(err, result, body) {
  if(err) return reject(err);
  var bodyObj = JSON.parse(body);
  resolve(bodyObj.access_token);
})
});
}