WP Autoembed MemberPress thank you page messages

mepr-autoembed-thankyou-page-messages.php

<?php
/* Enter Your Custom Functions Here */
function mepr_autoembed_thankyou_message($message) {
    global $wp_embed;

    if(!class_exists('MeprTransaction')) { return $message; }

    if(!isset($_REQUEST['trans_num'])) { return $message; }

    $txn = new MeprTransaction();
    $data = MeprTransaction::get_one_by_trans_num($_REQUEST['trans_num']);
    $txn->load_data($data);

    if(!$txn->id || !$txn->product_id) { return $message; }

    $product = $txn->product();

    if($product->ID === null || !$product->thank_you_page_enabled || empty($product->thank_you_message)) {
      return $message;
    }

    $message = stripslashes($product->thank_you_message);
    $message = wpautop($wp_embed->autoembed($message));
    $message = do_shortcode($message);

    if(class_exists('MeprHooks')) {
        MeprHooks::do_action('mepr-thank-you-page', $txn);
    }

    return '<div id="mepr-thank-you-page-message">'.$message.'</div>';
}
add_filter('mepr_custom_thankyou_message', 'mepr_autoembed_thankyou_message');

This looks like something I might enjoy, I just can't quite put my finger on exactly what its supposed to do or how I should use it. Can you shed some light on this for me. Thanks

I'm looking for a way to create a custom page template for my MP Thank-You page and choose to put the custom TY message into a tabbed box. Any thoughts?