Francisco Panis Kaseker

The problem is this line:

1745c1745
<             return esc_attr("");
---
>             return esc_attr("http://affiliatetracker.io/?aff=".$id."&affuri=".base64_encode($link));

affiliatetracker.io does not exist. https://affiliatetrack.io/ exist. Probably imunify identified the base64_encode.

function wpgm_pro_link($link) {
    if (defined('wpgm_aff')) {
        $id = sanitize_text_field(wpgm_aff);
        if ($id && $id !== "") {
            return esc_attr("http://affiliatetracker.io/?aff=".$id."&affuri=".base64_encode($link));
        } else {
            return esc_attr($link);
        }

    } else {
        return esc_attr($link);
    }
}

I think is safe to press Clean button, as this link does not exist, so the function is actually doing nothing due wrong link. Also, not sure if the plugin really needs that to work properly. I just a way that author can get informations about your site.