Batch update several orders in WOOCommerce (acf field

functions.php

<?php

add_filter( "bulk_actions-edit-shop_order", function($actions) {
?>
<script>
jQuery(document).ready(function($){
  $('#bulk-action-selector-top')
    // This field will let us enter a batch number for this action
    .after('<input id="batch-number-input" name="batch-number" />')
    // Show/hide input if update batch is selected
    .change(function(e) {
      $('#batch-number-input')[e.target.value == 'update-batch' ? 'show' : 'hide']()
    })
    // Ensure it's hidden on page load ( or shown if they clicked back )
    .trigger('change')
  ;
})
</script>
<?php
  $actions[ 'update-batch'] = "Update Batch Number";
  return $actions;
}, 9 );



add_action( "admin_init", function() {
    // Make sure that we on "Woocomerce orders list" page
    if ( !isset($_GET['post_type']) || $_GET['post_type'] != 'shop_order' ) {
        return;
    }

    if ( isset($_GET['action']) && 'update-batch' == $_GET['action'] ) {

        // Check Nonce
        if ( !check_admin_referer("bulk-posts") ) {
            return;
        }

        $batchNumber =  $_GET['batch-number'];
        $posts = $_GET['post'];
        foreach ($posts as $postID) {
            if ( !is_numeric($postID) ) {
                continue;
            }
            //$order = new WC_Order( (int)$postID );
            //$order->update_status( $new_status, 'Bulk actions' );
            update_field('batch-number', $batchNumber, (int)$postID);
        }
        wp_redirect(wp_get_referer());
    }
}, 0 );