$method = '/add.new.ajax';
$params = ['field' => 'value'];

$queryUrl = 'https://mycoolsite.ru' . $method;
        $queryData = http_build_query($params);

        $curl = curl_init();
        curl_setopt_array($curl, array(
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_POST           => 1,
            CURLOPT_HEADER         => 0,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_URL            => $queryUrl,
            CURLOPT_POSTFIELDS     => $queryData,
            CURLOPT_VERBOSE        => 1));
        $result = curl_exec($curl);

        curl_close($curl);
        $result = json_decode($result, 1);