protected function sendPostRequest($resource, $params)
    {
        $response = $this->sendRequest(
            'POST',
            $this->getServiceUrl($resource),
            [
                'headers' => [
                    'Accept' => 'application/x-yametrika+json',
                    'Content-Type' => 'application/x-yametrika+json',
                    'Authorization' => 'OAuth ' . $this->getAccessToken(),
                ],
                'json' => $params
            ]
        );

        return $this->getDecodedBody($response->getBody());
    }