function yith_mailchimp_constructor()
 {
     load_plugin_textdomain('yith-wcmc', false, dirname(plugin_basename(__FILE__)) . '/languages/');
     require_once YITH_WCMC_INC . 'mailchimp/Mailchimp.php';
     require_once YITH_WCMC_INC . 'class.yith-wcmc.php';
     // Let's start the game
     YITH_WCMC();
     if (is_admin()) {
         require_once YITH_WCMC_INC . 'class.yith-wcmc-admin.php';
         YITH_WCMC_Admin();
     }
 }
<?php

/**
 * Integration settings page
 *
 * @author  Your Inspiration Themes
 * @package YITH WooCommerce Mailchimp
 * @version 1.0.0
 */
if (!defined('YITH_WCMC')) {
    exit;
}
// Exit if accessed directly
return apply_filters('yith_wcmc_integration_options', array('integration' => array('mailchimp-video-box' => array('name' => __('Upgrade to the PREMIUM VERSION', 'yith-wcmc'), 'type' => 'videobox', 'default' => array('plugin_name' => __('YITH WooCommerce Mailchimp', 'yith-wcmc'), 'title_first_column' => __('Discover the Advanced Features', 'yith-wcmc'), 'description_first_column' => __('Upgrade to the PREMIUM VERSION of YITH WOOCOMMERCE MAILCHIMP to benefit from all features!', 'yith-wcmc'), 'video' => array('video_id' => '125238913', 'video_image_url' => YITH_WCMC_URL . '/assets/images/video-thumb.jpg', 'video_description' => ''), 'title_second_column' => __('Get Support and Pro Features', 'yit'), 'description_second_column' => __('By purchasing the premium version of the plugin, you will take advantage of the advanced features of the product and you will get one year of free updates and support through our platform available 24h/24.', 'yith-wcmc'), 'button' => array('href' => function_exists('YITH_WCMC_Admin_Premium') ? YITH_WCMC_Admin_Premium()->get_premium_landing_uri() : YITH_WCMC_Admin()->get_premium_landing_uri(), 'title' => 'Get Support and Pro Features')), 'id' => 'yith_wcmc_general_videobox'), 'mailchimp-options' => array('title' => __('MailChimp Options', 'yith-wcmc'), 'type' => 'title', 'desc' => '', 'id' => 'yith_wcmc_mailchimp_options'), 'mailchimp-api-key' => array('title' => __('MailChimp API Key', 'yith-wcmc'), 'type' => 'text', 'id' => 'yith_wcmc_mailchimp_api_key', 'desc' => __('API key used to access MailChimp account; you can get one <a href="//admin.mailchimp.com/account/api/">here</a>', 'yith-wcmc'), 'default' => '', 'css' => 'min-width:300px;'), 'mailchimp-status' => array('title' => __('Integration status', 'yith-wctc'), 'type' => 'yith_wcmc_integration_status', 'id' => 'yith_wcmc_integration_status'), 'mailchimp-options-end' => array('type' => 'sectionend', 'id' => 'yith_wcmc_mailchimp_options'))));
                    chosen; and if you don't like automatic processes, you can always download the <b>CSV</b> file with all
                    their details, so that you can manage it as you prefer.
                </p>

            </div>
            <div class="col-1">
                <img src="<?php 
echo YITH_WCMC_URL;
?>
assets/images/08.png" alt="Number" />
            </div>
        </div>
    </div>
    <div class="section section-cta section-odd">
        <div class="landing-container">
            <div class="premium-cta">
                <p>
                    Upgrade to the <span class="highlight">premium version</span>
                    of <span class="highlight">YITH WooCommerce Mailchimp</span> to benefit from all features!
                </p>
                <a href="<?php 
echo YITH_WCMC_Admin()->get_premium_landing_uri();
?>
" target="_blank" class="premium-cta-button button btn">
                    <span class="highlight">UPGRADE</span>
                    <span>to the premium version</span>
                </a>
            </div>
        </div>
    </div>
</div>