function testTwitterConnection() {
  var twitterKeys = {
    TWITTER_CONSUMER_KEY: 'iqoWfLEG1Q4eMGptxiEzb83Da',
    TWITTER_CONSUMER_SECRET: 'g6EJijC9Nsrc2D6WazXjF353FNATZzCvtCoigtBoUMfCQeW0L',
  };

  setupTwitter(twitterKeys);
  searchTwitter('ctrlq');
}

function setupTwitter(twitterKeys) {
  // URL encode the consumer key and the consumer secret according to RFC 1738
  var encodedConsumerKey = encodeURIComponent(twitterKeys.TWITTER_CONSUMER_KEY);
  var encodedConsumerSecret = encodeURIComponent(twitterKeys.TWITTER_CONSUMER_SECRET);

  // Concatenate the encoded consumer key, a colon character “:”, and the encoded consumer secret into a single string.
  // Base64 encode the string from the previous step.
  var base64EncodedBearerToken = Utilities.base64Encode(encodedConsumerKey + ':' + encodedConsumerSecret);

  // Step 2: Obtain a bearer token

  // The request must be a HTTP POST request.
  // The request must include an Authorization header with the value of Basic .
  // The request must include a Content-Type header with the value of application/x-www-form-urlencoded;charset=UTF-8.
  // The body of the request must be grant_type=client_credentials.

  var bearer_url = 'https://api.twitter.com/oauth2/token';
  var options = {
    method: 'POST',
    headers: {
      Authorization: 'Basic ' + base64EncodedBearerToken,
      'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
    },
    payload: {
      grant_type: 'client_credentials',
    },
  };

  var response = UrlFetchApp.fetch(bearer_url, options);
  var data = JSON.parse(response.getContentText());

  // Store the Access Token
  if (data.access_token) {
    PropertiesService.getScriptProperties().setProperty('TWITTER_ACCESS_TOKEN', data.access_token);
  }

  return data.access_token;
}

function searchTwitter(query) {
  var access_token = PropertiesService.getScriptProperties().getProperty('TWITTER_ACCESS_TOKEN');

  if (access_token === null) {
    Logger.log('Run Twitter setup again');
    return;
  }

  var base_url = 'https://api.twitter.com/1.1/search/tweets.json';
  var search_url = base_url + '?q=' + encodeURIComponent(query);

  var options = {
    method: 'GET',
    headers: {
      Authorization: 'Bearer ' + access_token,
      'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
      'Accept-Encoding': 'gzip',
    },
    followRedirects: true,
    muteHttpExceptions: true,
  };

  var response = UrlFetchApp.fetch(search_url, options);
  var data = JSON.parse(response.getContentText());
  var tweets = data.statuses;

  // Output the tweets in the log
  // They can also be saved in a Google Spreadsheet

  for (var t = 0; t < tweets.length; t++) {
    Logger.log('%s wrote: %s', tweets[t].user.name, tweets[t].text);
  }
}