public function createMultiple(array $subscribers)
    {
        $defaults = ['language' => 'sv', 'update_on_duplicate' => true, 'tags' => [], 'automation' => false];

        $subscribers = array_merge($defaults, $subscribers);

        foreach ($subscribers['subscribers'] as $subscriber) {
            $this->assertValidSubscriberParams($subscriber);
        }

        $params = [
            'automation' =>  $subscribers['automation'],
            'update_on_duplicate' => $subscribers['update_on_duplicate'],
            'tags' => $subscribers['tags']
        ];

        $params['subscribers'] = array_map(function($subscriber){
            return $this->getSubscriberParams($subscriber);
        }, $subscribers['subscribers']);

        $request = new Request('subscribers');
        $request->setParams($params);

        $response = $this->client->post($request);

        $this->assertSuccessResponse($response);

        return $response->getData();
    }