Code for (Shortcode Creation and Extracting MetaKey Value from Post) | Add this code to function.php file of your WordPress theme

AdditinFunctionsfile.txt

function shortcode_listing_expiry() {
    // Get the current post ID
    $post_id = get_the_ID();

    // Get the _expiry_date meta value for the current post
    $expiry_date = get_post_meta($post_id, '_expiry_date', true);

    // Output the meta value
    if (!empty($expiry_date)) {
        $output = '<p>Expiry Date: ' . esc_html($expiry_date) . '</p>';
    } else {
        $output = '<p>No expiry date found for this post.</p>';
    }

    return $output;
}

add_shortcode('show_listing_expiry', 'shortcode_listing_expiry');