apply_filters ( 'wordads_ads_txt', string WordAds_API::get_wordads_ads_txt() )

Notes

You can use this filter to add your custom texts from other ad programs.

add_filter( 'wordads_ads_txt', 'htdat_wordads_ads_txt'); 

function htdat_wordads_ads_txt ( $ads_txt_transient ) {
  $my_text = "#My custom texts";
  $my_text .= "\r\n"; // new line 	
  $my_text .= "google.com, pub-0000000000000000, DIRECT, f08c47fec0942fa0"; // Edit your own text here
  $my_text .= "\r\n \r\n"; // two new lines 
  return $my_text . $ads_txt_transient; 
}