private static function get_file(): string
  {
    if ( null === self::$path ){
      if ( \defined('BBN_DATA_PATH') ){
        self::$path = BBN_DATA_PATH;
      }
      else{
        self::$path = __DIR__.'/';
      }
    }
    return self::$path.'plugins/appui-cron/appui-observer.txt';
  }
private static function get_file(): string
  {
    if ( null === self::$path ){
      if ( \defined('BBN_DATA_PATH') ){
        self::$path = BBN_DATA_PATH;
      }
      else{
        self::$path = __DIR__.'/';
      }
    }
    return self::$path.'plugins/appui-cron/appui-observer.txt';
  }
private static function get_file ( ) : string { if ( null === self :: $ path ) { if ( \ defined ( 'BBN_DATA_PATH' ) ) { self :: $ path = BBN_DATA_PATH ; } else { self :: $ path = __DIR__ . '/' ; } } return self :: $ path . 'plugins/appui-cron/appui-observer.txt' ; }
Returns the observer txt file's full path.

@return string
Returns the observer txt file s full path .