Change property name of stdClass Object

I am writing json response for woocommerce website for new mobile app. I am totally new to json,php,woocommerce.

From lot of searching I got this API working.this

I am getting response like this when I use this line

$data = $client->products->get('', array('filter[limit]' => '500'));

stdClass Object
(
    [products] => Array
        (
            [0] => stdClass Object
                (
                    [title] => Malai tikka roll
                    [id] => 2580
                    [created_at] => 2017-05-22T08:13:56Z
                    [updated_at] => 2017-05-22T08:14:38Z
                    [type] => simple
                    [status] => publish
                    [downloadable] => 
                    [virtual] => 
                    [permalink] => http://localhost/fooddemo/product/malai-tikka-roll/
                    [sku] => 
                    [price] => 75.00
                    [regular_price] => 75.00
                    [sale_price] => 

Now I want to do is change some fields and send json response through $response object to my android app.

I tried doing this but it gives me error $response["Title"] = $data["title"];

Undefined index: title in C:\xampp\htdocs\demoservice\productlist.php on line 15

Sample code

<?php 
require_once( 'lib/woocommerce-api.php' );
$options = array(
    'debug'           => true,
    'return_as_array' => false,
    'validate_url'    => false,
    'timeout'         => 30,
    'ssl_verify'      => false,
);
$response = array("error" => FALSE);
try{
    require_once( 'key.php' );
    $data = $client->products->get('', array('filter[limit]' => '500'));
    //echo json_encode($response);
    $response["Title"] = $data["title"];
}catch ( WC_API_Client_Exception $e ) {

    require_once( 'catch.php' );
}