View difference between Paste ID: Pa0LLiLh and 0cAd8BPs

 /**
  * Aelia EU VAT Assistant for WooCommerce - Add an order note when a valid VAT number is stored with an order.
  * NOTE
- * This code runs every time the VAT evidence is saved against an order. It doesn't check if the order note was
+ * This code runs when the order meta is saved at checkout. It won't add an order note when the meta is added
- * already added with the same VAT number. Using this code with the example at https://pastebin.com/Pa0LLiLh could
+ * to manual orders, or via code.
- * result in the note being added multiple times.
+
  * DISCLAIMER
  * Because this code is free of charge, there is no warranty for it, to the extent permitted by applicable law.
  * Except when otherwise stated in writing the copyright holders and/or other parties provide the program "as is"
  * without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of
  * merchantability and fitness for a particular purpose. The entire risk as to the quality and performance of the program
  * is with you. should the program prove defective, you assume the cost of all necessary servicing, repair or correction.
  *
  * The code is provided as an example and it's not covered by our support service. We won't be able to offer free support
  * in relation to it. Should you need a consultation, or assistance to customise this code, you can contact us to avail
  * of our paid consultation services: https://aelia.co/hire_us
  */
 add_action('woocommerce_checkout_update_order_meta', function($order_id, $posted_data) {
-add_filter('wc_aelia_eu_vat_assistant_store_vat_evidence',  function($vat_evidence, $order) {
+  $order = wc_get_order($order_id);
   $vat_number = $order->get_meta('vat_number');
-  if(!empty($vat_evidence['exemption']['vat_number']) &&
+
-     !empty($vat_evidence['exemption']['vat_number_validated']) &&
+
-     ($vat_evidence['exemption']['vat_number_validated'] === 'valid')) {
+  if(!empty($vat_number) &&
-    $order->add_order_note('VAT Number: ' . $vat_evidence['exemption']['vat_number']);
+     ($order->get_meta('_vat_number_validated') === 'valid')) {
     $order->add_order_note('VAT Number: ' . $vat_number);
-  // Return the VAT evidence as is, we don't need to modify it
+
-  return $vat_evidence;
+