linnworks_insert.php

<?php

 function insert_order(){
$token = 'MYtoken';
 $post_data =[
     'orders' =>[
         [
             "UseChannelTax" => "true",
             "pkOrderId" => "fc1dd6d9-749c-4622-9725-f6ccf7c55299"
         ]
         ],
         "location" =>[
             "Default"
         ]
         ];


 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, "https://eu-ext.linnworks.net/api/Orders/CreateOrders");
 curl_setopt($ch, CURLOPT_POST, 1);
 curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($post_data));
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
 curl_setopt($ch, CURLOPT_HTTPHEADER, array(
     'Authorization: ' . $token,
     'Content-Type: application/x-www-form-urlencoded'
 ));

 $response = curl_exec($ch);
 $response = json_decode($response);

var_dump($response);
 
}

insert_order();