public function handle( $handle ) {

		// Sanitize the handle name.
		$this->handle = $this->utility->sanitize_handle( $handle );

		// Register this handle with the frontend class.
		$this->frontend->register_handle( $this->handle );

		// Register the Ajax handler in the WordPress hook system.
		add_action( 'wp_ajax_'        . $this->handle, array( $this, 'ajax_handler' ) );
		add_action( 'wp_ajax_nopriv_' . $this->handle, array( $this, 'ajax_handler' ) );

		return $this;
	}