public function costsCreate(array $cost, $site = null)
    {
        if (!count($cost)) {
            throw new \InvalidArgumentException(
                'Parameter `cost` must contains a data'
            );
        }

        /* @noinspection PhpUndefinedMethodInspection */
        return $this->client->makeRequest(
            '/costs/create',
            "POST",
            $this->fillSite($site, ['cost' => json_encode($cost)])
        );
    }