Notify if Stripe is put in Test Mode

add_action('update_option_woocommerce_stripe_settings', function($old_value, $value, $option) {

    if (!isset($old_value['testmode']) || !isset($value['testmode'])) {

        return;

    }

    if ($old_value['testmode'] === $value['testmode']) {

        return;

    }

    $optionName = 'woocommerce_stripe_testmode_log';

    $entry = [

        'time'   => current_time('mysql'),

        'uri'    => $_SERVER['REQUEST_URI'] ?? '',

        'hook'   => current_filter(),

        'old'    => $old_value['testmode'],

        'new'    => $value['testmode'],

        'user'   => get_current_user_id(),

        'ip'     => $_SERVER['REMOTE_ADDR'] ?? '',

        'full'   => $value, // entire new option value

        'context' => [

            'is_admin' => is_admin(),

            'is_ajax'  => wp_doing_ajax(),

            'is_cron'  => defined('DOING_CRON') && DOING_CRON,

        ],

        'trace'  => array_slice(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS), 0, 5),

    ];

    // Send notification email about testmode change

    $sendTo = [

        '[email protected]',

        '[email protected]',

        '[email protected]',

    ];

    $subject = 'WooCommerce Stripe Testmode Changed';

    $body = sprintf(

        "Testmode changed from '%s' to '%s' by user ID %d on %s\nRequest URI: %s",

        $old_value['testmode'],

        $value['testmode'],

        get_current_user_id(),

        current_time('mysql'),

        $_SERVER['REQUEST_URI'] ?? ''

    );

    $headers = ['Content-Type: text/plain; charset=UTF-8'];

    $emailResults = [];

    foreach ($sendTo as $email) {

        $result = [

            'email' => $email,

            'sent' => false,

            'error' => null,

        ];

        try {

            $mailSent = wp_mail($email, $subject, $body, $headers);

            $result['sent'] = (bool)$mailSent;

        } catch (\Exception $e) {

            $result['error'] = $e->getMessage();

            if (function_exists('error_log')) {

                error_log('Stripe testmode email error: ' . $e->getMessage());

            }

        }

        $emailResults[] = $result;

    }

    $entry['email_results'] = $emailResults;

    $log = get_option($optionName, []);

    if (!is_array($log)) {

        $log = [];

    }

    $log[] = $entry;

    $maxLogEntries = 10;

    if (count($log) > $maxLogEntries) {

        $log = array_slice($log, -$maxLogEntries, $maxLogEntries, true);

    }

    // recursion protection

    remove_action('update_option_woocommerce_stripe_settings', __FUNCTION__, 10);

    update_option($optionName, $log, false);

    add_action('update_option_woocommerce_stripe_settings', __FUNCTION__, 10, 3);

}, 10, 3);