public function postCampaignsSend($campaignId, $contacts)
    {
        $data = [
            'username' => $this->getApiUsername(),
            'password' => $this->getApiPassword(),
            'campaignId' => $campaignId,
            'ContactIds' => $contacts,
        ];
        $this->setUrl($this->getApiEndpoint() . self::REST_CAMPAIGN_SEND)
            ->setVerb('POST')
            ->buildPostBody($data);

        $response = $this->execute();
        if (isset($response->message)) {
            unset($data['password']);
            $message = 'SENDING CAMPAIGN ' . $response->message;
            $this->helper->debug('postCampaignsSend', [$message]);
            $this->helper->debug('postCampaignsSend', $data);
        }

        return $response;
    }