Edit

Editing: general-settings.php

<?php
defined('ABSPATH') or exit;
?>
<div id="mc4wp-admin" class="wrap mc4wp-settings">

<p class="mc4wp-breadcrumbs">
        <span class="prefix"><?php echo esc_html__('You are here: ', 'mailchimp-for-wp'); ?></span>
        <span class="current-crumb"><strong>Mailchimp for WordPress</strong></span>
    </p>

<h1 class="mc4wp-page-title">
                Mailchimp for WordPress: <?php echo esc_html__('API Settings', 'mailchimp-for-wp'); ?>
            </h1>

<h2 style="display: none;"></h2>
            <?php
            settings_errors();
            $this->messages->show();
            ?>

<form action="<?php echo esc_attr(admin_url('options.php')); ?>" method="post">
                <?php settings_fields('mc4wp_settings'); ?>

<tr valign="top">
                        <th scope="row"><label for="mailchimp_api_key"><?php echo esc_html__('API Key', 'mailchimp-for-wp'); ?></label></th>
                        <td>
                            <input type="text" class="widefat" placeholder="<?php echo esc_attr__('Your Mailchimp API key', 'mailchimp-for-wp'); ?>" id="mailchimp_api_key" name="mc4wp[api_key]" value="<?php echo esc_attr($obfuscated_api_key); ?>" <?php echo defined('MC4WP_API_KEY') ? 'readonly="readonly"' : ''; ?> />
                            <p class="description">
                                <?php echo esc_html__('The API key for connecting with your Mailchimp account.', 'mailchimp-for-wp'); ?>
                                <a target="_blank" href="https://admin.mailchimp.com/account/api"><?php echo esc_html__('Get your API key here.', 'mailchimp-for-wp'); ?></a>
                            </p>

<?php
                            if (defined('MC4WP_API_KEY')) {
                                echo '<p class="description">', wp_kses(__('You defined your Mailchimp API key using the <code>MC4WP_API_KEY</code> constant.', 'mailchimp-for-wp'), [ 'code' => [] ]), '</p>';
                            }
                            ?>
                        </td>
                    </tr>
                </table>

<?php submit_button(); ?>
            </form>

<?php
            do_action('mc4wp_admin_after_general_settings');

if (! empty($opts['api_key'])) {
                echo '<hr />';
                include __DIR__ . '/parts/lists-overview.php';
            }

require __DIR__ . '/parts/admin-footer.php';

?>
        </div>

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