plimor

gistfile.php

add_action( 'wcasn_form_fields', 'wcasn_custom_form_fields' );
function wcasn_custom_form_fields( $order_id ) { ?>
  <label>Nota Fiscal</label>
  <input type="text" name="nota_fiscal" class="wcasn-custom-fields" value="" />
<?php }

add_filter( 'wc_any_shipping_notify_shipping_company_url', 'filter_wcasn_custom_url_fields', 20, 4 );
function filter_wcasn_custom_url_fields( $url, $slug, $tracking_code, $order ) {
  if ( $custom_url = $order->get_meta( '_wcasn_' . $tracking_code . '_custom_url' ) ) {
    return $custom_url;
  }
  if ( isset( $_POST['custom_fields'] ) ) {
    $find_replace = array();
    foreach ( $_POST['custom_fields'] as $k => $v ) {
      $find_replace[ '{' . $k . '}' ] = $v;
    }
    $url = str_replace( array_keys( $find_replace ), array_values( $find_replace ), $url );
    $order->update_meta_data( '_wcasn_' . $tracking_code . '_custom_url', $url );
    $order->save();
  }
  return $url;
}