public function ajax_handler() {

		if ( $this->utility->validate_nonce( $this->handle ) && $this->validator->validate_all() ) {

			$callback_response = $this->utility->get_callback_response( $this->handle, $this->handle_callback, $this->handle_callback_args );
			$this->responder->handle_response( $callback_response );

		} else {

			http_response_code( 403 ); // Forbidden.
		}

		die();
	}