add_action( 'woocommerce_subscription_date_updated', function( $subscription, $date_type ) {
    // Only proceed if it's a next_payment date change
    if ( 'next_payment' !== $date_type || is_admin() ) {
        return;
    }

    // Make sure WP Fusion is active
    if ( ! function_exists( 'wp_fusion' ) ) {
        return;
    }

    // Sync the subscription fields
    wp_fusion()->integrations->{'woo-subscriptions'}->sync_subscription_fields( $subscription );
}, 10, 2 );