function AmazonAPI(isbn) {
  var region = 'com',
    method = 'GET',
    uri = '/onca/xml',
    host = 'ecs.amazonaws.' + region;

  var private_key = 'AWS Secret Access Id',
    public_key = 'AWS Access Key',
    associate_tag = 'labnol-20';

  var params = {
    Service: 'AWSECommerceService',
    Version: '2011-08-01',
    AssociateTag: associate_tag,
    Operation: 'ItemLookup',
    SearchIndex: 'Books',
    ItemId: isbn,
    Timestamp: new Date().toISOString(),
    AWSAccessKeyId: public_key,
    IdType: 'ISBN',
    ResponseGroup: 'ItemAttributes',
  };

  var canonicalized_query = Object.keys(params).sort();

  canonicalized_query = canonicalized_query.map(function (key) {
    return key + '=' + encodeURIComponent(params[key]);
  });

  var string_to_sign = method + '\n' + host + '\n' + uri + '\n' + canonicalized_query.join('&');

  var signature = Utilities.base64Encode(Utilities.computeHmacSha256Signature(string_to_sign, private_key));

  var request =
    'http://' + host + uri + '?' + canonicalized_query.join('&') + '&Signature=' + encodeURIComponent(signature);

  var response = UrlFetchApp.fetch(request);

  return XmlService.parse(response.getContentText());
}

function getBookInfo() {
  var isbn = 'xyz'; // Put the 10 or 13 digital ISBN here

  var o = {};
  var response = AmazonAPI(isbn);
  var a = response.getDescendants();

  for (var i = 0; i < a.length; i++) {
    if (a[i].getType() == XmlService.ContentTypes.ELEMENT) {
      switch (a[i].asElement().getName()) {
        case 'Title':
          o.title = a[i].asElement().getText();
          break;
        case 'FormattedPrice':
          o.price = a[i].asElement().getText();
          break;
      }
    }
  }

  Logger.log(o);
}