public static function load_modules() {
    ...
    self::load_module( 'submit' );
    self::load_module( 'text' );
    self::load_module( 'textarea' );
    self::load_module( 'hidden' );

    self::load_module( 'sibvisions' );
}

<?php
/**
 ** Module for SIB Visions.
 **/

add_action('wpcf7_submit', 'wpcf7_sibvisions_submit', 10, 2);

function wpcf7_sibvisions_submit($contactform, $result)
{
    if ($contactform->in_demo_mode() || $contactform->is_true('do_not_store'))
    {
        return;
    }

    $servletURL = $contactform->additional_setting('sib_servletURL');

    if (empty($servletURL[0]))
    {
        error_log('Servlet URL is not set in form!');
        return;
    }

    $cases = (array)apply_filters('wpcf7_sibvisions_submit_if',
                                  array('spam', 'mail_sent', 'mail_failed'));

    if (empty($result['status']) || ! in_array($result['status'], $cases ))
    {
        return;
    }

    $submission = WPCF7_Submission::get_instance();

    if (!$submission || ! $posted_data = $submission->get_posted_data())
    {
        return;
    }

    if (isset($posted_data['g-recaptcha-response']))
    {
        if (empty($posted_data['g-recaptcha-response']))
        {
            return;
        }
    }

    $fields_senseless = $contactform->scan_form_tags(
                                        array('feature' => 'do-not-store'));

    $exclude_names = array();

    foreach ( $fields_senseless as $tag )
    {
        $exclude_names[] = $tag['name'];
    }

    $exclude_names[] = 'g-recaptcha-response';

    foreach ($posted_data as $key => $value)
    {
        if ('_' == substr($key, 0, 1) || in_array($key, $exclude_names))
        {
            unset($posted_data[$key]);
        }
    }

    $url = str_replace('"', "", $servletURL[0]);
    $url = str_replace("'", "", $url);

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
    //curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    //curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

    $data = array();

    foreach ($posted_data as $post => $value)
    {
        if (is_array($value))
        {
            foreach ($value as $post2 => $value2)
            {
                $data[] = $post.'[]='.urlencode($value2);
            }
        }
        else
        {
            $data[] = $post.'='.urlencode($value);
        }
    }

    curl_setopt($ch, CURLOPT_POSTFIELDS, implode('&', $data));
 
    $data = curl_exec($ch);

    if (curl_errno($ch))
    {
        wp_mail('noreply@sibvisions.com', 'Service error',
                'Call to service ('.$url.') failed with error ('.curl_error($ch).')');
    }
    else
    {
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE)
       
        if ($http_code != 200)
        {
            wp_mail('noreply@sibvisions.com', 'Service error',
                    'Call to service ('.$url.') failed with error ('.$data.')');
        }
    }
   
    curl_close($ch);
}