src/Client.php
public function setOrderCapturedStatus(Order $order) 
    {  
        try {
            $transactionId = $order->transactions()->current()->id()->toString();
            $response = $this->getHttpClient()
                ->method(Http::POST)
                ->uri($this->baseUrl . 'orders/' . $order->id() . '/transactions/'. $transactionId . '/captures/')
                ->timeout(30)
                ->sends(Mime::JSON)
                ->send();

            if ($response->hasErrors()) {
                throw new \Exception($response->raw_body, $response->code);
            }

            return Transaction::fromArray($response->body);
        } catch (\Exception $exception) {
            if ($exception->getCode() == 404) {
                throw new OrderNotFoundException('No order with that ID was found.', 404, $exception);
            }
            throw new ClientException(
                'An error occurred while updating the order: '.$exception->getMessage(),
                $exception->getCode(),
                $exception
            );
        }
    }
public function setOrderCapturedStatus(Order $order) 
    {  
        try {
            $transactionId = $order->transactions()->current()->id()->toString();
            $response = $this->getHttpClient()
                ->method(Http::POST)
                ->uri($this->baseUrl . 'orders/' . $order->id() . '/transactions/'. $transactionId . '/captures/')
                ->timeout(30)
                ->sends(Mime::JSON)
                ->send();

            if ($response->hasErrors()) {
                throw new \Exception($response->raw_body, $response->code);
            }

            return Transaction::fromArray($response->body);
        } catch (\Exception $exception) {
            if ($exception->getCode() == 404) {
                throw new OrderNotFoundException('No order with that ID was found.', 404, $exception);
            }
            throw new ClientException(
                'An error occurred while updating the order: '.$exception->getMessage(),
                $exception->getCode(),
                $exception
            );
        }
    }
update the order status to captured

@param  Order $order
@throws OrderNotFoundException
@throws ClientException
@return Transaction