filter for ast_tracking_link

very well, I’ll sit tight.

PS: for multilingual I use WPML
I hope you can make it so that customers can access SAGAWA and YAMATO tracking services in Japanese unless the customer is viewing the website in any other language than that. … or at least always in Japanese and not in English

thank you for improving Sagawa and JP-Post

you are correct about Yamato, my mistake…
Yamato needs the tracking number submitted as $_POST data …

in another application, I pass the anchor href in this format:
https://toi.kuronekoyamato.co.jp/cgi-bin/tneko?1234-1234-1234
to a jQuery function, like this:

let 
 url = href.split('?')[0],
 tracker = href.split('?')[1],
 form = new Array;

form[0] = '<form target="_blank" accept-charset="utf-8" method="post" action="' + url + '">';
  form[1] = '<input type="hidden" name="number01" value="' + tracker + '" />'
form[2] = '</form>';
$(form.join('')).appendTo('body').submit().remove();