maybe_send_recovery_mode_email example

        if ( ! $this->is_active() ) {
            if ( ! is_protected_endpoint() ) {
                return new WP_Error( 'non_protected_endpoint', __( 'Error occurred on a non-protected endpoint.' ) );
            }

            if ( ! function_exists( 'wp_generate_password' ) ) {
                require_once ABSPATH . WPINC . '/pluggable.php';
            }

            return $this->email_service->maybe_send_recovery_mode_email( $this->get_email_rate_limit(), $error, $extension );
        }

        if ( ! $this->store_error( $error ) ) {
            return new WP_Error( 'storage_error', __( 'Failed to store the error.' ) );
        }

        if ( headers_sent() ) {
            return true;
        }

        $this->redirect_protected();
    }