PayPal\Api\RelatedResources::setOrder PHP Method

    public function setOrder($order)
    {
        $this->order = $order;
        return $this;
    }

 public static function createRelatedResources()
 {
     $relatedResources = new RelatedResources();
     $relatedResources->setAuthorization(AuthorizationTest::createAuthorization());
     $relatedResources->setCapture(CaptureTest::createCapture());
     $relatedResources->setOrder(OrderTest::createOrder());
     return $relatedResources;
 }