Implement WHMCS Addon Dashboard with API for stats and integrate billing provider logic

docs/IMPLEMENTATION_STATUS.md

@@ -2,7 +2,39 @@
 
 Last updated: 2026-06-26
 
-## Current phase: WHMCS Phase E + F — Sync & Usage Billing ✅
+## Current phase: WHMCS Addon Dashboard ✅
+
+### WHMCS Addon module completed
+
+| Area | Status | Notes |
+|------|--------|-------|
+| Addon PHP module | Done | Dashboard, events, reconciliation UI |
+| Module tables | Done | `mod_hexagamecloud_*` on activation |
+| Event poller | Done | Manual + daily cron hook |
+| Dashboard API | Done | `GET /integrations/whmcs/dashboard/stats` |
+| Cron hook | Done | `integrations/whmcs/hooks/hexagamecloud.php` |
+| Docs | Done | `docs/integrations/whmcs/addon-module.md` |
+
+### Billing providers
+
+| Provider | Status | Notes |
+|----------|--------|-------|
+| WHMCS | Done | **Production default** (`BILLING_PROVIDER=whmcs`) |
+| Internal | Done | Dev / free tier credits |
+| Stripe | Stub | Optional fallback webhook — inactive unless `BILLING_PROVIDER=stripe` |
+
+See `docs/billing/providers.md`.
+
+### Abnahmekriterium Addon
+
+- [x] WHMCS admin dashboard shows API health and sync stats
+- [x] Event poll + ack from addon UI and cron hook
+- [x] Reconciliation dry-run from addon UI
+- [ ] Manual E2E: activate addon on WHMCS host
+
+---
+
+## WHMCS Phase E + F — Sync & Usage Billing ✅
 
 ### WHMCS Phase E completed
 
@@ -234,4 +266,4 @@ Server entry fields:
 
 ### Next phase: Post-MVP hardening
 
-- Stripe webhooks, penetration test, WHMCS addon dashboard UI
+- Penetration test, product mapping UI in addon, mTLS for integration API