Modifying the share URL | WordPress.org

The Affiliates developer has an add-on that seems to integrate with AddToAny, but it requires their paid version.

The AddToAny plugin’s Additional JavaScript box doesn’t parse shortcodes right now, but you could look into exposing the Affiliates ID in an HTML meta tag on your pages like:

<meta name="affiliates-id" content="1">

Then have your AddToAny share event grab the ID like:

a2a_config.callbacks.push({
  share: function (shareData) {
    var affiliatesId = document.querySelector('meta[name="affiliates-id"]').getAttribute('content');
    if (affiliatesId) {
      return {
        url: shareData.url + '?affliates=" + affiliatesId,
      };
    }
  }
});