Using API v2 of WooCommerce

EDIT:
Incase anyone is reading this, I made this post before the v2 api was documented, however documentation is now available, so if you’re having issues, refer to: http://woothemes.github.io/woocommerce-rest-api-docs/#introduction

I’m trying to update the PHP REST API client library found here: https://github.com/kloon/WooCommerce-REST-API-Client-Library.

I changed the API_ENDPOINT to wc-api/v2/ and I added this function:

public function create_order( $data ) {
    return $this->_make_api_call( 'orders/', $data, 'POST' );
}

I get:

Warning:  rawurldecode() expects parameter 1 to be string, array given in /home/class-wc-api-client-    v2.php on line 441
Warning:  rawurldecode() expects parameter 1 to be string, array given in /home/class-wc-api-client-v2.php on line 441
  object(stdClass)#1801 (1) {
 ["errors"]=>
 array(1) {
   [0]=>
   object(stdClass)#1798 (2) {
     ["code"]=>
     string(3) "401"
     ["message"]=>
     string(19) "cURL HTTP error 401"
   }
 }
}

I am using the following code to call create_order

$data = array(
    "status" => "processing",
    "payment_details" => array("method_id" => "paypal", "method_title" => "PayPal", "paid" => 1),
    "line_items" => array("id" => 123, "subtotal" => 45.00, "total" => 45.00, "total_tax" => 0.00, "price" => 45.00, "quantity" => 1, "name" => "itemName", "product_id" => 123)
);
var_dump($wc_api->create_order($data));

Any help?

Thank you!