/**
  * Get the class instance
  */
 public static function get_instance()
 {
     return null === self::$instance ? self::$instance = new self() : self::$instance;
 }
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 /**
  * Include required files
  *
  * @since 1.4.0
  */
 private function includes()
 {
     require 'includes/class-wc-shipment-tracking.php';
     $this->actions = WC_Shipment_Tracking_Actions::get_instance();
 }