nShift Unifaun - returnPart

functions.php

<?php

/**
 * @snippet       WooCommerce - Sets custom returnpart in Unifaun
 * @author        Redlight Media AB / Christopher Hedqvist
 * @compatible    WooCommerce 6.2.0
 */
function redlight_unifaun_bring_return_part( $shipment, $order ) {
   if( 'PNL342' === $shipment['service']['id'] ){
      $shipment['returnPart']['quickId'] = 'RETURNPART1';
   }
    return $shipment;
}
add_filter('ac_wc_unifaun_shipment_data', 'redlight_unifaun_bring_return_part', 10, 2 );