public function store(Request $request, Order $order)
 {
     if (!$this->user()->can('cancel', $order)) {
         return $this->error(OrderCancellation::CAN_NOT_CANCEL);
     }
     $me = $this->user();
     $this->orderManager->createCancellation($order, $request->all(), $me, $me->isOrderBuyer($order) ? $order->getSeller() : $order->getBuyer());
     return $this->success();
 }