Updating order WooCommerce API PHP CURL - php

Question

I'm developing a web application for my co-workers, so they'll have an iPad with an application, to package our orders.
Whole app is almost finished, one of the last steps is to change order status from processing to completed.
What I'm doing:
Get current order ID, then change status with curl or API. What happens is very strange, I get JSON data back, and the completed_at time updated, but status is still processing.
Below you will see my code:
$data = array("status" => "completed");
$data_string = json_encode($data);
$username = 'XXX'; // Add your own Consumer Key here
$password = 'XXX'; // Add your own Consumer Secret here
$ch = curl_init('https://www.deallerleukste.nl/wc-api/v2/orders/5764?consumer_key='.$username.'&consumer_secret='.$password);
curl_setopt($ch, CURLOPT_USERPWD, $username . ":" . $password);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($data_string))
);
$result = curl_exec($ch);
echo $result;
Anyone who sees what I'm doing wrong? Please help!
Regards,
Jelmer

Answer 1

Try Using this code
$data='{ "order": { "status": "completed" }}';
or
Dynamically
$data=json_encode( array( 'order' => array( 'status' => $status)));
in $status you can pass the status u want.

Answer 2

I see it is a quite old post, but today I ran into the same problem, so maybe it is useful.
You have to use PUT instead of POST here:
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
and data should be a valid JSON in this format:
$data='{"status": "completed"}';