Unifaun - MyPack over 1500

functions.php

<?php
/**
 * @snippet       WooCommerce - Change Service to MyPack Collect if order total over 1500
 * @author        Redlight Media AB / Christopher Hedqvist
 * @compatible    WooCommerce 3.9.0
 */
function redlight_unifaun_mypack_over_1500( $shipment, $order ) {
  if($order->get_total() > 1500 ){
    $shipment['service']['id'] = 'P19';
  }

  return $shipment;
}
add_filter('ac_wc_unifaun_shipment_data', 'redlight_unifaun_mypack_over_1500', 10, 2 );