Any WooCommerce-to-Fortnox integration that stores its sync state and document references in wc_orders_meta or postmeta. Most of the popular ones do, including the official Fortnox-branded integration and several community variants. The column picker reads the actual meta keys present in your install, so it works with whatever your integration writes.

Yes. SleekView reads wc_orders and wc_orders_meta on HPOS (default since WooCommerce 8.2) and falls back to shop_order posts plus postmeta on legacy stores. The same SleekView config works across both schemas.

Status edits route through WooCommerce CRUD, so the integration's hook listener (typically on woocommerce_order_status_changed) fires and a re-sync runs as configured. For integrations exposing a custom sync action via a button, SleekView can attach that action as a row-level button as well.

No. SleekView writes to WordPress, not to Fortnox. Changes flow Fortnox-ward through your integration's existing hooks and API client. Direct writes to _fortnox_invoice_number are possible (for back-office corrections) but gated behind a per-view setting and conflict detection.

If the integration stores Fortnox customer numbers on WordPress users via usermeta, SleekView can present a users-rooted view with Fortnox customer number, total spent, and recent order count as columns. This is the closest you get to a CRM view without a separate sync.

Yes, if the integration stores VAT IDs and country codes in meta. SleekView's column picker lists keys present in your data, so VAT-relevant fields show up automatically. Combine them with date range and currency to build a quarterly VAT reconciliation view.

Queries hit indexed columns on wc_orders directly. Meta filters use wc_orders_meta joins, which are indexed by order_id and meta_key. Aggregate columns (total synced this month) are opt-in per view so triage views stay responsive.

SleekView itself is an in-admin tool, not a notification system. For alerting, hook into the integration's existing error events or use a separate notification plugin. SleekView's role is making the failed-syncs list trivially visible during normal admin work, so checking it becomes part of the daily routine.