function trigger_wpf_nationbuilder( $entry, $form ) {

    if ( ! function_exists( 'wp_fusion' ) ) {
        return;
    }

    $feeds = wp_fusion()->integrations->{'gravity-forms'}->get_feeds( $entry['form_id'] );

    foreach ( $feeds as $feed ) {

        if ( $feed['addon_slug'] == 'wpfgforms' ) {

            wp_fusion()->integrations->{'gravity-forms'}->process_feed( $feed, $entry, $form );

        }

    }

}

add_action( 'gform_post_add_entry', 'trigger_wpf_nationbuilder', 10, 2 );