gets all the items together in a merged array
function itemsCallback(error, itemsResponse) {
    if (error) throw error;

    var items = itemsResponse.searchResult.item;

    console.log('Found', items.length, 'items');
    
    for (var i = 0; i < items.length; i++) {
      console.log('- ' + items[i].title);
    }  
  }