Url problem

Hello there,
thanks for contacting us!

Please try adding the following code in the functions.php file of your active theme and check if it solves the problem:

if ( ! function_exists( 'get_referral_url_custom' ) ) {
    function get_referral_url_custom( $url, $ref_name, $token, $base_url ) { 
      if( isset( $_REQUEST['base'] ) ) {
          $url = $_REQUEST['base'] . "?" . $ref_name . "=" . $token;
      }
      return $url;
    }
    add_filter( 'yith_wcaf_get_referral_url','get_referral_url_custom', 10, 4 );
}

Please let me know.

Best regards.