Woocommerce rest API - 'Error: Invalid signature - provided signature does not match - php

Question

I'm trying to download order details from a woocommerce API for easy display and update purpose.
I tested the entire setup locally with two separate web addresses. One for test woocommerce install [copy from production site] and one for order display webpage.
Everything works fine locally. But when I connect the order display to production. It downloads all orders and display according to my design, But when I try to update an order it throws an exception.
After googling for a while found that this could be caused by timezone differences, checked time on both server and my pc it was spot on.
Anyway I changed
php timezone to correct one on both server and pc php.ini and restarted httpd
changed server linux timezone and rebooted the server.
Still, I get following only in production[hosted in AWS]. In no expert on php, but got some programming knowledge. Anyone who can point me to correct direction?
Fatal error: Uncaught exception
'Automattic\WooCommerce\HttpClient\HttpClientException' with message 'Error:
Invalid signature - provided signature does not match.
[woocommerce_rest_authentication_error]' in
C:\xampp\htdocs\orderdash\vendor\automattic\woocommerce\src\WooCommerce\HttpClient\HttpClient.php:348 Stack trace: #0
C:\xampp\htdocs\orderdash\vendor\automattic\woocommerce\src\WooCommerce\HttpClient\HttpClient.php(378): Automattic\WooCommerce\HttpClient\HttpClient->lookForErrors(Object(stdClass)) #1
C:\xampp\htdocs\orderdash\vendor\automattic\woocommerce\src\WooCommerce\HttpClient\HttpClient.php(414): Automattic\WooCommerce\HttpClient\HttpClient->processResponse() #2
C:\xampp\htdocs\orderdash\vendor\automattic\woocommerce\src\WooCommerce\Client.php(69): Automattic\WooCommerce\HttpClient\HttpClient->request('orders/544', 'PUT', Array) #3
C:\xampp\htdocs\orderdash\index.php(149): Automattic\WooCommerce\Client->put('orders/544', Array) #4 {main} thrown in
C:\xampp\htdocs\orderdash\vendor\automattic\woocommerce\src\WooCommerce\HttpClient\HttpClient.php on line 348
Connection
$woocommerce = new Client('http://example.com/',
'ck_321cad474478e1275',
'cs_76f8566e67cd7aa31',
['wp_api' => true, 'version' => 'wc/v1']);
Download orders
$data = ['status' => 'processing'];
$order_details = $woocommerce->get('orders',$data);
update data [use a button submit]
$update_order_id = $_POST['orderid'];
$st = ['status' => 'completed'];
$woocommerce->put('orders/'. $update_order_id, $st);