I am writing php code to communicate with ShippingEasy through  ShippingEasy PHP API. I have account in ShippingEasy and have API key and Store API Key.

Please assist me how I can communicate with PHP code. I am writing code like bellow:

////////////////////////////////////////////////////////////////////////////////////

<?php

require_once("shipping_easy-php-master/lib/ShippingEasy.php");

$apiKey = "a05fb63cc358613a32922de087396200"; // Api Key
$store_apiKey = "d33d9e33e7e78d354deb637c2467cfa7"; // Store API Key
ShippingEasy::setApiKey($apiKey);

//// sample test order data array from https://gist.github.com/twmills/8711096
$order_arr = array(
"external_order_identifier" => "ABC-1004",
"ordered_at" => "2014-01-16 14:37:56 -0600",
"order_status" => "awaiting_shipment", ..... );

$order = new ShippingEasy_Order($store_apiKey , $order_array);
$order->create();

//////////////////////////////////////////////////////////////////////////////////

But the above code giving me error Access Denied. Please guide me how to get authentication with ShippingEasy.