chore(release): 1.4.0

Opt-in per product via WHMCS's native tblproducts.stockcontrol toggle.
When enabled, the module overwrites tblproducts.qty with the number of
VPSes the panel can still actually provision, derived from two
authoritative sources:

  - GET /packages/{id} for the per-VPS resource footprint (memory,
    cpuCores, primaryStorage, primaryStorageProfile, enabled)
  - GET /compute/hypervisors/groups/{id}/resources for live
    free/allocated data per hypervisor in the group

Algorithm sums min(memory, cpu, storage) across eligible hypervisors
(enabled AND commissioned AND !prohibit) for every group the product
can be placed in (default configoption1 plus every numeric value of a
Location configurable option), capped by the group-level IPv4 pool
taken as max() within a group to avoid double-counting. Storage
matching is strict against package.primaryStorageProfile; hypervisors
without the named pool contribute 0.

FAIL-SAFE INVARIANT: transient API failures return null from
Module::fetchPackage / Module::fetchGroupResources, and the orchestrator
leaves tblproducts.qty UNCHANGED in that case. Confirmed-missing
conditions (HTTP 404, package.enabled=false) return qty=0. Without this
tri-state contract the module would either zero out inventory during
API blips, or show inventory for packages that have been deleted.

Triggers:
  - AfterModuleCreate: refresh + auto-accept pending order
  - AfterModuleTerminate: refresh (capacity came back)
  - AfterCronJob: every-2-hour safety net for out-of-band panel changes
  - ClientAreaPageCart: opportunistic per-product refresh in order flow
  - admin.php?action=stockRecalculate: on-demand full recalc

Shared 30s rate-limit (stockrefresh:event) coalesces provision bursts;
60s per-product limit (stockrefresh:{pid}) caps cart-page refreshes;
grpres:{id} 120s TTL caps upstream API reads per group regardless of
how often hooks fire.

Auto-accept: AfterModuleCreate calls WHMCS AcceptOrder with
autosetup=false when the parent order is still Pending. Idempotent;
already-accepted orders are skipped via strcasecmp status check.

New per-product config option stockSafetyBufferPct (configoption7,
default 10) reserves X% of each resource's max before computing fits.
Blank falls back to 10% so existing products get headroom without any
config change. Ignored for unlimited resources (max=0) and for IPv4
(no per-hypervisor max in the response).

TestConnection now probes /compute/hypervisors/groups to surface
missing compute:read scope at config time instead of as unexplained
nightly silence.

.github/workflows/publish-release.yml

@@ -1,43 +1,168 @@
 name: Publish Release
 
+# -----------------------------------------------------------------------------
+# Release-notes strategy (in order of preference):
+#
+#   1. If CHANGELOG.md has a "## [X.Y.Z] - YYYY-MM-DD" section matching the
+#      tag version, use that section verbatim. This is the normal path —
+#      maintainers write release notes once in CHANGELOG and they flow to
+#      GitHub automatically with no re-typing.
+#
+#   2. Otherwise, fall back to grouping the commits in the tag range by
+#      conventional-commit prefix (feat / fix / refactor / docs / other).
+#      Keeps releases useful even if the maintainer forgot the CHANGELOG.
+#
+#   3. Append a compare link (PREV_TAG...TAG) at the bottom so readers can
+#      dive into the full diff in one click.
+#
+# Retag safety:
+#   When a tag is force-pushed (e.g. to fix a last-minute doc error), the
+#   workflow normally would overwrite any hand-edited release body. We guard
+#   against that by checking the current release body BEFORE running the
+#   generator — if a body is already present, we leave it alone. To
+#   intentionally regenerate, clear the body first via:
+#     gh release edit vX.Y.Z --notes ""
+#
+# Security note:
+#   All ${{ ... }} interpolation in this file flows through `env:` blocks
+#   rather than inline in `run:` commands. Shell scripts reference those
+#   env vars with $VAR, which is immune to the command-injection pattern
+#   that hits workflows interpolating untrusted event data directly.
+# -----------------------------------------------------------------------------
+
 on:
   push:
     tags:
       - 'v*'
 
+permissions:
+  contents: write
+
 jobs:
   release:
     runs-on: ubuntu-latest
-    permissions:
-      contents: write
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          # Need full history for `git describe` to find the previous tag and
+          # for `git log PREV..HEAD` to enumerate commits in the release range.
+          fetch-depth: 0
 
-      - name: Extract tag name
-        id: tag
-        run: echo "version=${GITHUB_REF#refs/tags/}" >> "$GITHUB_OUTPUT"
+      - name: Derive versions
+        id: version
+        env:
+          REF: ${{ github.ref }}
+        run: |
+          TAG="${REF#refs/tags/}"
+          VERSION="${TAG#v}"
+          # Previous tag for compare link + commit range. Empty on first release.
+          PREV_TAG=$(git describe --tags --abbrev=0 "$TAG^" 2>/dev/null || echo "")
+          echo "tag=$TAG"           >> "$GITHUB_OUTPUT"
+          echo "version=$VERSION"   >> "$GITHUB_OUTPUT"
+          echo "prev_tag=$PREV_TAG" >> "$GITHUB_OUTPUT"
+          echo "Tag: $TAG   Version: $VERSION   Previous: ${PREV_TAG:-<none>}"
+
+      - name: Check for existing release body
+        id: existing
+        env:
+          GH_TOKEN: ${{ github.token }}
+          TAG: ${{ steps.version.outputs.tag }}
+          REPO: ${{ github.repository }}
+        run: |
+          # If the release already has a non-empty body, skip generation so
+          # hand-edits survive tag re-pushes. Fresh releases (no body) proceed.
+          BODY=$(gh release view "$TAG" --repo "$REPO" --json body -q .body 2>/dev/null || echo "")
+          if [ -n "$(printf '%s' "$BODY" | tr -d '[:space:]')" ]; then
+            echo "Existing release body detected — preserving manual edits."
+            echo "skip=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "No existing body (or empty) — will generate."
+            echo "skip=false" >> "$GITHUB_OUTPUT"
+          fi
 
       - name: Generate release notes
-        id: notes
+        if: steps.existing.outputs.skip != 'true'
+        env:
+          VERSION:  ${{ steps.version.outputs.version }}
+          TAG:      ${{ steps.version.outputs.tag }}
+          PREV_TAG: ${{ steps.version.outputs.prev_tag }}
+          REPO:     ${{ github.repository }}
         run: |
-          # Get previous tag
-          PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
-          if [ -n "$PREV_TAG" ]; then
-            NOTES=$(git log --pretty=format:"- %s" "$PREV_TAG"..HEAD)
-          else
-            NOTES=$(git log --pretty=format:"- %s")
+          set -eo pipefail
+
+          # --- 1. Try extracting the section from CHANGELOG.md --------------
+          # Matches "## [1.2.0] ..." exactly and prints every line up to the
+          # next "## [" heading or EOF.
+          CHANGELOG_SECTION=""
+          if [ -f CHANGELOG.md ]; then
+            CHANGELOG_SECTION=$(awk -v ver="$VERSION" '
+              $0 ~ "^## \\[" ver "\\]" { found=1; next }
+              found && /^## \[/         { exit }
+              found                     { print }
+            ' CHANGELOG.md)
           fi
-          # Write to file for the release body
-          echo "$NOTES" > /tmp/release-notes.txt
+
+          # --- 2. Commit-based fallback ------------------------------------
+          # Used only when CHANGELOG has no section for this version. Groups
+          # conventional-commit prefixes into readable categories; skips
+          # automated "chore(release): …" bump commits from display since
+          # they're noise in a release the reader is already looking at.
+          if [ -z "$(printf '%s' "$CHANGELOG_SECTION" | tr -d '[:space:]')" ]; then
+            echo "::warning::CHANGELOG.md has no section for [$VERSION]; falling back to commit-log grouping."
+
+            if [ -n "$PREV_TAG" ]; then RANGE="$PREV_TAG..HEAD"; else RANGE=""; fi
+            LOG=$(git log $RANGE --no-merges --pretty=format:'%s' \
+              | grep -vE '^chore\(release\)' || true)
+
+            # extract <regex> — prints matching commits as "- <rest>" with the
+            # conventional-commit "type(scope)?:" prefix stripped for readability.
+            extract() {
+              printf '%s\n' "$LOG" \
+                | grep -E "^($1)(\([^)]+\))?:" \
+                | sed -E "s/^($1)(\([^)]+\))?:[[:space:]]*/- /" \
+                || true
+            }
+
+            FEATURES=$(extract 'feat')
+            FIXES=$(extract 'fix')
+            REFACTORS=$(extract 'refactor')
+            DOCS=$(extract 'docs')
+            OTHER=$(printf '%s\n' "$LOG" \
+              | grep -vE '^(feat|fix|refactor|docs|chore)(\([^)]+\))?:' \
+              | sed -E 's/^/- /' \
+              || true)
+
+            {
+              [ -n "$FEATURES"  ] && printf '### Features\n\n%s\n\n'       "$FEATURES"
+              [ -n "$FIXES"     ] && printf '### Bug Fixes\n\n%s\n\n'      "$FIXES"
+              [ -n "$REFACTORS" ] && printf '### Changes\n\n%s\n\n'        "$REFACTORS"
+              [ -n "$DOCS"      ] && printf '### Documentation\n\n%s\n\n'  "$DOCS"
+              [ -n "$OTHER"     ] && printf '### Other\n\n%s\n\n'          "$OTHER"
+            } > /tmp/generated.md
+
+            CHANGELOG_SECTION=$(cat /tmp/generated.md)
+          fi
+
+          # --- 3. Compose final body (content + compare footer) ------------
+          {
+            printf '%s\n' "$CHANGELOG_SECTION"
+            if [ -n "$PREV_TAG" ]; then
+              printf '\n---\n\n**Full Changelog:** [%s...%s](https://github.com/%s/compare/%s...%s)\n' \
+                "$PREV_TAG" "$TAG" "$REPO" "$PREV_TAG" "$TAG"
+            fi
+          } > /tmp/release-notes.md
+
+          echo "--- release notes ($(wc -c < /tmp/release-notes.md) bytes) ---"
+          head -20 /tmp/release-notes.md
+          echo "---"
 
       - name: Create release
+        if: steps.existing.outputs.skip != 'true'
         uses: softprops/action-gh-release@v2
         with:
-          tag_name: ${{ steps.tag.outputs.version }}
-          name: ${{ steps.tag.outputs.version }}
-          body_path: /tmp/release-notes.txt
+          tag_name: ${{ steps.version.outputs.tag }}
+          name: ${{ steps.version.outputs.tag }}
+          body_path: /tmp/release-notes.md
           draft: false
           prerelease: false
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

CHANGELOG.md

@@ -2,6 +2,47 @@
 
 All notable changes to the VirtFusion Direct Provisioning Module for WHMCS.
 
+## [1.4.0] - 2026-04-24
+
+### Features
+- **Dynamic VPS stock control driven by live hypervisor capacity.** Opt-in per product via WHMCS's native `tblproducts.stockcontrol` toggle; when enabled, the module overwrites `tblproducts.qty` with the real number of VPSes the panel can still provision and WHMCS handles the "Out of Stock" badge, Add-to-Cart gating, and checkout refusal natively — no template work required. qty is derived by combining two authoritative sources:
+  - `GET /packages/{packageId}` for the per-VPS resource footprint (`memory`, `cpuCores`, `primaryStorage`, `primaryStorageProfile`, `enabled`)
+  - `GET /compute/hypervisors/groups/{id}/resources` for live per-hypervisor free/allocated data
+
+  Algorithm sums `min(memory, cpu, storage)` across eligible hypervisors (enabled AND commissioned AND !prohibit) for every group the product can be placed in (default `configoption1` plus every numeric value of a `Location` configurable option), capped by the group-level IPv4 pool taken as `max()` within a group to avoid double-counting. Storage matching is strict against `package.primaryStorageProfile`; hypervisors without the named pool contribute 0. Confirmed-missing conditions (HTTP 404 on `/packages/{id}`, `package.enabled=false`) force qty=0; transient failures leave `qty` UNTOUCHED to avoid false out-of-stock during API blips.
+
+- **Event-driven stock recalculation hooks:**
+  - `AfterModuleCreate` — refreshes qty after every VirtFusion provision (capacity just decreased). Bursts of parallel provisions coalesce via a 30 s shared rate-limit.
+  - `AfterModuleTerminate` — refreshes qty after every VirtFusion termination (capacity just increased). Shares the 30 s rate-limit with create.
+  - `AfterCronJob` — every-2-hour safety net that catches capacity changes made directly in the VirtFusion panel without going through WHMCS. Interval tunable via `STOCK_CRON_INTERVAL_SECONDS` in `hooks.php`.
+  - `ClientAreaPageCart` — opportunistic per-product refresh during the order flow, rate-limited to once per product per 60 s.
+
+- **Order auto-accept after successful provision.** `AfterModuleCreate` calls WHMCS `AcceptOrder` (with `autosetup=false` so there's no double-provision) when the parent order is still in Pending status. Closes the gap for installs that rely on pending-order workflows for non-VF products but want VirtFusion provisions to auto-advance. Idempotent — already-accepted orders are skipped.
+
+- **Admin-triggered full recalculation.** New `admin.php?action=stockRecalculate` action (POST + same-origin required) runs `StockControl::recalculateAll()` on demand and returns a JSON `{productId: qty}` map; the module log gets a compact summary (`{total, updated, zeroed, skipped}`) so it stays readable on stores with hundreds of products.
+
+- **Per-product safety buffer.** New `stockSafetyBufferPct` config option (configoption7, default 10) reserves X% of each resource's `max` during stock calculation. Applied only to capped resources (unlimited resources with `max=0` skip the buffer). Admins can override per product in the module settings; blank falls back to 10% so existing products get sensible headroom without any config change.
+
+- **Test Connection now probes `/compute/hypervisors/groups`.** A VirtFusion API token scoped only to `/servers` would pass the existing `/connect` check but silently break nightly stock updates. The admin's Test Connection button now surfaces missing `/compute` read scope at config time with a specific error rather than as unexplained nightly silence.
+
+### Caching
+- New cache keys: `pkg:{packageId}` (10 min TTL, package definitions rarely change) and `grpres:{groupId}` (120 s TTL, resources change minute-to-minute under load). Confirmed 404 responses are cached for 60 s so an admin re-creating a deleted package/group takes effect quickly.
+
+### Safety Properties
+- `Module::fetchPackage()` and `Module::fetchGroupResources()` return a tri-state `array | false | null`: `false` means "VirtFusion confirmed this doesn't exist → OOS is correct", `null` means "we can't tell right now → don't touch existing qty". Without this distinction the module would either zero out inventory during transient API blips, or show inventory for deleted packages.
+- `\Throwable` catches on every stock-path entry point (not just `\Exception`) so a `TypeError` from a malformed API response can't escape the tri-state contract.
+- Stock-control is gated by `tblproducts.stockcontrol=1` — products that opt out are never touched, even by the safety-net cron.
+
+## [1.3.0] - 2026-04-17
+
+### Bug Fixes
+- **Critical: decrypt() corruption of plaintext addon API keys.** `Config::get()` was calling WHMCS's `decrypt()` on the raw `tbladdonmodules.value` for the PowerDNS API key and accepting whatever non-empty result came back. WHMCS addon password-type fields are actually stored **plaintext** (unlike `tblservers.password` which is encrypted), and `decrypt()` on plaintext input returns ~4 bytes of binary garbage instead of empty. That garbage was ending up in the `X-API-Key:` header, producing a baffling 401 from PowerDNS and an empty zone list — which then surfaced as **"no zone"** for every IP in the client-area rDNS panel. Fix: only use `decrypt()`'s output when it's printable ASCII; fall back to raw otherwise. Also `trim()` the chosen value so a stray paste-newline can't corrupt the header.
+
+### Features
+- **IPv6 subnet visibility + custom-host PTR flow.** VirtFusion allocates v6 as whole subnets (e.g. a /64 routed to the VPS) rather than discrete host addresses. The module previously filtered these silently; now subnets appear as first-class rows in the client rDNS panel with a collapsible "Add host PTR" form. Ownership verification uses **subnet containment** (`IpUtil::ipv6InSubnet()` via `inet_pton` + bit masking) so any address inside one of the VPS's allocated subnets is writeable, while addresses outside them are rejected. FCrDNS / rate-limit / CSRF guards all still apply.
+- **Diagnose-an-IP tool** on the VirtFusion DNS addon admin page. Takes an IP input and runs the full PtrManager pipeline inline: config snapshot, fresh zone list (cache-bypassed), computed PTR name, matched zone, current PTR content. Every common failure mode (wrong key, wrong serverId, forgotten zone, mis-aligned RFC 2317 label, stale cache) produces a distinctive shape in that output, turning "support ticket" into "screenshot the diagnosis".
+- **Actionable auth-error messages.** `Client::ping()` now returns structured guidance on 401/403 (check API key, `api-allow-from`, whitespace) and 404 (check `serverId`, it should be the literal `localhost`), replacing the previous "authentication failed (check API key)" / "unexpected HTTP 404" which gave no clue which of several causes was actually biting.
+
 ## [1.2.0] - 2026-04-17
 
 ### Features

CLAUDE.md

@@ -69,6 +69,7 @@ The `publish-release.yml` workflow creates a GitHub/Gitea release with auto-gene
 | `PowerDns\IpUtil` | Pure helpers: `ptrNameForIp` (v4/v6 nibble reversal), `expandIpv6`, `extractIps` (all interfaces), `findZoneAndPtrName` (standard + RFC 2317 classless), `parseClasslessZone`. |
 | `PowerDns\Resolver` | Forward-DNS verification via `dns_get_record()` with up-to-5-hop CNAME following. Cached per (hostname, ip) pair. |
 | `PowerDns\PtrManager` | Orchestrator: `syncServer`, `deleteForServer`, `listPtrs`, `setPtr`, `reconcile`, `reconcileAll`. Per-request zone cache. 10s per-IP write rate limit. Enforces FCrDNS before writes. |
+| `StockControl` | Orchestrator for dynamic inventory. `recalculateForProduct()` and `recalculateAll()` compute per-product qty from live `/packages/{id}` + `/compute/hypervisors/groups/{id}/resources` data and write to `tblproducts.qty`. Fail-safe: null return = qty untouched. |
 
 ### Class Hierarchy
 
@@ -134,6 +135,38 @@ Opt-in integration via the companion `VirtFusionDns` addon module. Loose-coupled
 
 Custom option names can be mapped in `config/ConfigOptionMapping.php` (copy from `-example.php`). Default mapping keys: `packageId`, `hypervisorId`, `ipv4`, `storage`, `memory`, `traffic`, `cpuCores`, `networkSpeedInbound`, `networkSpeedOutbound`, `networkProfile`, `storageProfile`.
 
+### Inventory / Stock Control
+
+Opt-in per product via WHMCS's native stock-control toggle (`tblproducts.stockcontrol=1`). When enabled, the module overwrites `tblproducts.qty` with the real number of VPSes that can still be provisioned — WHMCS then handles the "Out of Stock" badge, Add-to-Cart gating, and checkout refusal natively. No templates or JS required.
+
+**Data sources (authoritative):**
+- `GET /packages/{id}` — per-VPS resource footprint (`memory`, `cpuCores`, `primaryStorage`, `primaryStorageProfile`, `enabled`)
+- `GET /compute/hypervisors/groups/{id}/resources` — live free/allocated per hypervisor with per-metric quotas, storage pools (matched by package.primaryStorageProfile), and a group-level IPv4 pool
+
+**Algorithm:** for every group the product can be placed in (default `configoption1` plus every numeric value of the `Location` configurable option), sum `min(memory, cpu, storage)` across eligible hypervisors (enabled AND commissioned AND !prohibit) and cap by the group-level IPv4 pool (`max` across hypervisors, not summed — IPv4 is a single group-wide pool). Sum across groups → qty.
+
+**Triggers:**
+- `AfterModuleCreate` — post-provision refresh; bursts rate-limited to one recalc per 30 s via `stockrefresh:event` cache key.
+- `AfterModuleTerminate` — post-termination refresh; shares the same 30 s rate-limit key.
+- `AfterCronJob` — every-2-hour safety net (captures out-of-band VirtFusion panel changes). Tunable via `STOCK_CRON_INTERVAL_SECONDS` constant in `hooks.php`.
+- `ClientAreaPageCart` — opportunistic per-product refresh on cart/order pages with a 60 s rate-limit key (`stockrefresh:{pid}`). The `grpres:{id}` cache (120 s TTL) naturally coalesces bursts.
+- `admin.php?action=stockRecalculate` — admin-triggered full recalc (POST + same-origin required); returns JSON `{productId: qty}` map.
+
+**Order auto-accept:** `AfterModuleCreate` additionally calls WHMCS `AcceptOrder` with `autosetup=false` when the service's parent order is still Pending. Closes the loop for installs that rely on pending-order workflows for non-VF products but want VF provisions to auto-advance.
+
+**Caching:** `pkg:{id}` 600 s (package definitions rarely change), `grpres:{id}` 120 s (resources change under load). Confirmed 404s cached 60 s so re-creating a deleted package/group takes effect quickly.
+
+**Safety properties:**
+- Transient API failures (null from `fetchPackage` / `fetchGroupResources`) leave `qty` UNTOUCHED — never silently takes the catalogue offline.
+- Confirmed-missing conditions (HTTP 404 on package, `package.enabled=false`) return qty=0 — the product genuinely cannot be provisioned.
+- IPv4 cap is max-within-group (not summed across hypervisors) to avoid double-counting the shared pool.
+- Storage match is strict: the package's `primaryStorageProfile` must exist and be enabled on the target hypervisor, otherwise that hypervisor contributes 0. Falls back to `localStorage` only when the package has no profile set.
+- Stock control is gated by `tblproducts.stockcontrol=1` per product — the module never touches qty on products that opt out.
+
+**Per-product setting:** `stockSafetyBufferPct` (configoption7, default 10). Reserves X% of each resource's `max` before computing fits; ignored for unlimited resources (`max=0`) and for IPv4 (no per-hypervisor `max` in the response). Admins can override per product in the module settings; blank falls back to 10%.
+
+**API scope required:** the VirtFusion API token must have read access to both `/packages` and `/compute/hypervisors/groups`. The Test Connection button probes the compute endpoint and shows a clear error if scope is missing.
+
 ## Security Patterns
 
 - All PHP files start with `if (!defined("WHMCS")) die()` to prevent direct access (except entry points using `init.php`)
@@ -173,6 +206,7 @@ Custom option names can be mapped in `config/ConfigOptionMapping.php` (copy from
 | configoption4 | Self-Service Mode | 0=Disabled, 1=Hourly, 2=Resource Packs, 3=Both | 0 |
 | configoption5 | Auto Top-Off Threshold | Credit balance below which auto top-off triggers | 0 |
 | configoption6 | Auto Top-Off Amount | Credit amount to add on auto top-off | 100 |
+| configoption7 | Stock Safety Buffer (%) | Headroom reserved per resource during stock calculation (0-100). Only effective with WHMCS stock control enabled. Blank falls back to the default. | 10 |
 
 ## WHMCS Compatibility
 

CODE_OF_CONDUCT.md

@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+support@ezscale.cloud.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.

modules/addons/VirtFusionDns/VirtFusionDns.php

@@ -41,6 +41,13 @@ function virtfusiondns_load_server_libs(): bool
         }
         require_once $base . $f;
     }
+    // PtrManager + IpUtil are only needed for the diagnostic tool below; load them
+    // if present but don't require them for the basic status page to work.
+    foreach (['PowerDns/Resolver.php', 'PowerDns/PtrManager.php'] as $optional) {
+        if (is_file($base . $optional)) {
+            require_once $base . $optional;
+        }
+    }
 
     return true;
 }
@@ -230,5 +237,131 @@ function VirtFusionDns_output($vars)
     echo '<li><code>api-allow-from</code> must include the WHMCS host\'s IP.</li>';
     echo '</ul>';
 
+    // -----------------------------------------------------------------------
+    // Diagnostic: "What does the module see for IP X?"
+    //
+    // Runs the full pipeline an admin would otherwise have to trace through
+    // multiple log lines to reproduce:
+    //   1. Current config (what values is Config::get() actually returning?)
+    //   2. Zone list (what does Client::listZones() return right now, post-cache?)
+    //   3. Zone match for an input IP (is findZoneAndPtrName selecting the right zone?)
+    //   4. Current PTR content at the located (zone, ptrName) pair
+    //
+    // Catches every common failure mode: wrong API key (empty zones, auth error),
+    // wrong server ID (404), forgotten zone (no match), stale cache (mismatched
+    // zones), and typos in the RFC 2317 zone name (parseClasslessZone rejection).
+    // -----------------------------------------------------------------------
+
+    echo '<h3 style="margin-top:24px">Diagnose an IP</h3>';
+    echo '<p>Runs the exact same pipeline the client-area rDNS panel uses. Useful when a specific IP shows "no zone" in the UI and you need to see <em>why</em>.</p>';
+
+    $diagIp = isset($_GET['diag_ip']) ? trim((string) $_GET['diag_ip']) : '';
+    echo '<form method="get" action="" style="display:flex;gap:8px;align-items:center;margin-bottom:12px">';
+    // WHMCS passes the module slug via ?module=... — preserve any existing query params
+    // by re-emitting the current GET state as hidden fields (except diag_ip itself).
+    foreach ($_GET as $k => $v) {
+        if ($k === 'diag_ip') {
+            continue;
+        }
+        echo '<input type="hidden" name="' . htmlspecialchars((string) $k, ENT_QUOTES, 'UTF-8') . '" value="' . htmlspecialchars((string) $v, ENT_QUOTES, 'UTF-8') . '">';
+    }
+    echo '<input type="text" name="diag_ip" placeholder="IP address (e.g. 198.51.100.42 or 2001:db8::1)" value="' . htmlspecialchars($diagIp, ENT_QUOTES, 'UTF-8') . '" class="form-control form-control-sm" style="max-width:320px;font-family:monospace">';
+    echo '<button type="submit" class="btn btn-primary btn-sm">Diagnose</button>';
+    echo '</form>';
+
+    if ($diagIp !== '') {
+        echo '<div style="background:#f8f9fa;border:1px solid #dee2e6;border-radius:4px;padding:12px;font-family:monospace;font-size:13px;white-space:pre-wrap;word-break:break-all">';
+
+        if (filter_var($diagIp, FILTER_VALIDATE_IP) === false) {
+            echo '<span style="color:#dc3545">Invalid IP address.</span>';
+        } elseif (! Config::isEnabled()) {
+            echo '<span style="color:#dc3545">Addon disabled or missing endpoint/API key. Diagnosis skipped.</span>';
+        } else {
+            $client = new Client;
+
+            echo '<strong>Config snapshot:</strong>' . "\n";
+            echo '  endpoint  = ' . htmlspecialchars($config['endpoint'], ENT_QUOTES, 'UTF-8') . "\n";
+            echo '  serverId  = ' . htmlspecialchars($config['serverId'], ENT_QUOTES, 'UTF-8') . "\n";
+            echo '  cacheTtl  = ' . $cacheTtl . 's' . "\n";
+            echo '  apiKey    = ' . ($config['apiKey'] !== '' ? '(set, ' . strlen($config['apiKey']) . ' chars)' : '(MISSING)') . "\n\n";
+
+            // Always forget cache before diagnose so we see the LIVE state, not a
+            // potentially-stale cached list from an earlier misconfigured call.
+            $client->forgetZoneCache();
+            $zones = $client->listZones();
+
+            echo '<strong>Live zone list (cache purged, ' . count($zones) . ' zones):</strong>' . "\n";
+            if (empty($zones)) {
+                echo '  <span style="color:#dc3545">NO ZONES RETURNED.</span>' . "\n";
+                echo '  Likely causes: wrong API key (PowerDNS returned 401/403), wrong Server ID' . "\n";
+                echo '  (PowerDNS returned 404), or api-allow-from blocking the WHMCS host IP.' . "\n";
+                echo '  Run the Test Connection button above to see the exact HTTP error.' . "\n\n";
+            } else {
+                foreach (array_slice($zones, 0, 15) as $z) {
+                    echo '  ' . htmlspecialchars($z, ENT_QUOTES, 'UTF-8') . "\n";
+                }
+                if (count($zones) > 15) {
+                    echo '  ... and ' . (count($zones) - 15) . ' more' . "\n";
+                }
+                echo "\n";
+            }
+
+            $ptrName = IpUtil::ptrNameForIp($diagIp);
+            echo '<strong>Computed PTR name for ' . htmlspecialchars($diagIp, ENT_QUOTES, 'UTF-8') . ':</strong>' . "\n";
+            echo '  ' . htmlspecialchars((string) $ptrName, ENT_QUOTES, 'UTF-8') . "\n\n";
+
+            $loc = IpUtil::findZoneAndPtrName($diagIp, $zones);
+            echo '<strong>Zone match (IpUtil::findZoneAndPtrName):</strong>' . "\n";
+            if ($loc === null) {
+                echo '  <span style="color:#dc3545">NO MATCH.</span>' . "\n";
+                echo '  The IP does not fall within any zone returned above.' . "\n";
+                if (IpUtil::isIpv4($diagIp)) {
+                    $oct = (int) explode('.', $diagIp)[3];
+                    echo "  For IPv4: confirm a standard reverse zone exists (one of the listed\n";
+                    echo "  zones should end with the first-three-octets-reversed of $diagIp), OR\n";
+                    echo "  that an RFC 2317 classless zone exists whose range covers octet $oct.\n";
+                }
+                if (IpUtil::isIpv6($diagIp)) {
+                    echo "  For IPv6: confirm a reverse zone exists ending in .ip6.arpa. whose\n";
+                    echo "  nibble prefix matches the high-order bits of $diagIp.\n";
+                }
+                echo "\n";
+            } else {
+                echo '  zone    = ' . htmlspecialchars($loc['zone'], ENT_QUOTES, 'UTF-8') . "\n";
+                echo '  ptrName = ' . htmlspecialchars($loc['ptrName'], ENT_QUOTES, 'UTF-8') . "\n\n";
+
+                // Actual current PTR content, if any.
+                echo '<strong>Current PTR record in PowerDNS:</strong>' . "\n";
+                $zoneData = $client->getZone($loc['zone']);
+                if ($zoneData === null) {
+                    echo '  <span style="color:#dc3545">Unable to fetch zone contents (HTTP error or not found).</span>' . "\n";
+                } else {
+                    $found = null;
+                    foreach ($zoneData['rrsets'] ?? [] as $rr) {
+                        if (($rr['type'] ?? '') === 'PTR' && rtrim($rr['name'], '.') === rtrim($loc['ptrName'], '.')) {
+                            foreach ($rr['records'] ?? [] as $rec) {
+                                if (empty($rec['disabled']) && ! empty($rec['content'])) {
+                                    $found = [
+                                        'content' => $rec['content'],
+                                        'ttl' => (int) ($rr['ttl'] ?? 0),
+                                    ];
+                                    break 2;
+                                }
+                            }
+                        }
+                    }
+                    if ($found === null) {
+                        echo '  (no PTR record present at ' . htmlspecialchars($loc['ptrName'], ENT_QUOTES, 'UTF-8') . ')' . "\n";
+                    } else {
+                        echo '  content = ' . htmlspecialchars($found['content'], ENT_QUOTES, 'UTF-8') . "\n";
+                        echo '  ttl     = ' . $found['ttl'] . 's' . "\n";
+                    }
+                }
+            }
+        }
+
+        echo '</div>';
+    }
+
     echo '</div>';
 }

modules/servers/VirtFusionDirect/VirtFusionDirect.php

@@ -114,6 +114,13 @@ function VirtFusionDirect_ConfigOptions()
             'Description' => 'Credit amount to add when auto top-off triggers.',
             'Default' => '100',
         ],
+        'stockSafetyBufferPct' => [
+            'FriendlyName' => 'Stock Safety Buffer (%)',
+            'Type' => 'text',
+            'Size' => '5',
+            'Description' => 'Reserved headroom applied per resource when calculating stock. Only effective when the WHMCS Stock Control toggle is enabled on this product. 0-100; ignored for resources with no quota set in VirtFusion. Default is 10% if left blank.',
+            'Default' => '10',
+        ],
     ];
 }
 
@@ -135,6 +142,28 @@ function VirtFusionDirect_TestConnection(array $params)
         $httpCode = $request->getRequestInfo('http_code');
 
         if ($httpCode == 200) {
+            // Probe the compute scope: stock control depends on read access to
+            // /compute/hypervisors/groups. A token scoped only to /servers will pass the
+            // /connect check above but silently break nightly stock recalculation, so we
+            // surface the missing scope at config time rather than a week later.
+            $groupsProbe = $module->initCurl($password);
+            $groupsProbe->get($url . '/compute/hypervisors/groups?results=1');
+            $groupsHttp = (int) $groupsProbe->getRequestInfo('http_code');
+
+            if ($groupsHttp === 401 || $groupsHttp === 403) {
+                return [
+                    'success' => false,
+                    'error' => 'VirtFusion OK but API token lacks read access to /compute/hypervisors/groups (HTTP ' . $groupsHttp . '). Stock Control will not work — re-issue the token with compute:read scope.',
+                ];
+            }
+
+            if ($groupsHttp !== 200) {
+                return [
+                    'success' => false,
+                    'error' => 'VirtFusion OK but /compute/hypervisors/groups returned HTTP ' . $groupsHttp . '. Stock Control may not work correctly.',
+                ];
+            }
+
             // Also verify PowerDNS health when the DNS addon is activated, so the
             // admin's Test Connection button reflects the full provisioning path.
             if (PowerDnsConfig::isEnabled()) {

modules/servers/VirtFusionDirect/admin.php

@@ -39,6 +39,7 @@ use WHMCS\Module\Server\VirtFusionDirect\Module;
 use WHMCS\Module\Server\VirtFusionDirect\PowerDns\Config as PowerDnsConfig;
 use WHMCS\Module\Server\VirtFusionDirect\PowerDns\PtrManager;
 use WHMCS\Module\Server\VirtFusionDirect\ServerResource;
+use WHMCS\Module\Server\VirtFusionDirect\StockControl;
 
 $vf = new Module;
 
@@ -169,6 +170,46 @@ try {
             $vf->output(['success' => true, 'data' => $summary], true, true, 200);
             break;
 
+            // =================================================================
+            // Stock Control
+            // =================================================================
+
+            /**
+             * Force a full stock-quantity recalculation across every VirtFusionDirect
+             * product that has WHMCS stock control enabled. Same logic as the 2-hour
+             * AfterCronJob safety-net hook and the post-provision / post-termination
+             * event hooks in hooks.php, but on-demand. Cache TTLs still govern freshness
+             * of the underlying VirtFusion API reads — run a separate cache bust first
+             * if the admin needs to bypass the 120 s grpres:{id} TTL.
+             *
+             * Usable by admins via POST; returns a JSON map of productId => qty (or null
+             * where the product was skipped / left untouched by the orchestrator).
+             */
+        case 'stockRecalculate':
+
+            $vf->requirePost();
+            $vf->requireSameOrigin();
+
+            $results = (new StockControl)->recalculateAll();
+
+            // Log a compact summary instead of the full map — the admin client still
+            // gets the detailed per-product map in the JSON response, but the module
+            // log stays readable even on stores with hundreds of VirtFusion products.
+            $summary = ['total' => count($results), 'updated' => 0, 'zeroed' => 0, 'skipped' => 0];
+            foreach ($results as $qty) {
+                if ($qty === null) {
+                    $summary['skipped']++;
+                } elseif ((int) $qty === 0) {
+                    $summary['zeroed']++;
+                } else {
+                    $summary['updated']++;
+                }
+            }
+            Log::insert('stockRecalculate:ok', [], $summary);
+
+            $vf->output(['success' => true, 'data' => $results], true, true, 200);
+            break;
+
         default:
             $vf->output(['success' => false, 'errors' => 'invalid action'], true, true, 400);
     }

modules/servers/VirtFusionDirect/client.php

@@ -544,15 +544,35 @@ try {
                 $vf->output(['success' => false, 'errors' => 'Unable to verify IP ownership'], true, true, 502);
                 break;
             }
-            $assigned = IpUtil::extractIps($serverData)['addresses'];
+            $extracted = IpUtil::extractIps($serverData);
             $targetBin = @inet_pton($ip);
             $owns = false;
-            foreach ($assigned as $a) {
+
+            // Stage 1: exact-IP match. Covers every v4 case and any v6 host address
+            // VirtFusion exposes directly (per-host records or /128 subnet entries).
+            foreach ($extracted['addresses'] as $a) {
                 if (@inet_pton($a) === $targetBin) {
                     $owns = true;
                     break;
                 }
             }
+
+            // Stage 2: v6 subnet containment. If the exact match failed and this is
+            // a v6 address, check whether it falls inside any of the server's
+            // allocated v6 subnets. This is the path for "my VirtFusion VPS has a
+            // /64 routed to it and I want a PTR for mail.example.com on one of the
+            // host addresses inside that /64" — we don't know which host addresses
+            // are actually in use, but we can prove this one lies within a range
+            // the customer is authorised for.
+            if (! $owns && IpUtil::isIpv6($ip)) {
+                foreach ($extracted['subnets'] as $s) {
+                    if (IpUtil::ipv6InSubnet($ip, $s['subnet'], (int) $s['cidr'])) {
+                        $owns = true;
+                        break;
+                    }
+                }
+            }
+
             if (! $owns) {
                 Log::insert('rdnsUpdate:ownership', ['serviceID' => $serviceID, 'ip' => $ip], 'IP not assigned to this service');
                 $vf->output(['success' => false, 'errors' => 'This IP is not assigned to your server'], true, true, 403);

modules/servers/VirtFusionDirect/hooks.php

@@ -19,7 +19,12 @@
  *
  * HOOKS REGISTERED HERE
  * ---------------------
+
  *   DailyCronJob                — PowerDNS reconciliation across all services
+ *   AfterCronJob                — Every-2-hour stock recalculation safety net
+ *   AfterModuleCreate           — Stock refresh + order auto-accept after a VPS provisions
+ *   AfterModuleTerminate        — Stock refresh after a VPS is destroyed
+ *   ClientAreaPageCart          — Lazy per-product stock refresh during the order flow
  *   ShoppingCartValidateCheckout — blocks checkout until OS is selected
  *   ClientAreaFooterOutput      — injects the OS/SSH-key gallery on order form
  *
@@ -32,12 +37,14 @@
  */
 
 use WHMCS\Database\Capsule;
+use WHMCS\Module\Server\VirtFusionDirect\Cache;
 use WHMCS\Module\Server\VirtFusionDirect\ConfigureService;
 use WHMCS\Module\Server\VirtFusionDirect\Database;
 use WHMCS\Module\Server\VirtFusionDirect\Log;
 use WHMCS\Module\Server\VirtFusionDirect\Module;
 use WHMCS\Module\Server\VirtFusionDirect\PowerDns\Config as PowerDnsConfig;
 use WHMCS\Module\Server\VirtFusionDirect\PowerDns\PtrManager;
+use WHMCS\Module\Server\VirtFusionDirect\StockControl;
 
 if (! defined('WHMCS')) {
     exit('This file cannot be accessed directly');
@@ -63,6 +70,190 @@ add_hook('DailyCronJob', 1, function ($vars) {
     }
 });
 
+/**
+ * Every-~2-hour stock recalculation safety net.
+ *
+ * Events (AfterModuleCreate/Terminate) cover every capacity change driven
+ * through WHMCS. But an operator can also create/destroy VMs directly in the
+ * VirtFusion panel — no WHMCS hook fires for that, so stock qty would drift
+ * until the next cart-page visit or the next event-driven refresh. This hook
+ * closes that blind spot.
+ *
+ * AfterCronJob fires on every main WHMCS cron invocation (typically every
+ * 5 minutes). Cache::get on the rate-limit key means the hook is effectively
+ * free on the 99% of invocations where no recalc is due — one cache read,
+ * return. The actual recalc only runs when the key has expired.
+ *
+ * Interval: 2 hours. Tunable via the STOCK_CRON_INTERVAL_SECONDS constant
+ * below. Short enough that out-of-band VirtFusion panel changes surface the
+ * same business day; long enough that the storefront isn't writing
+ * tblproducts.qty every five minutes.
+ *
+ * FAIL-SAFE: StockControl::recalculateAll() returns a map of productId =>
+ * qty|null, where null means the orchestrator left qty UNTOUCHED (transient
+ * API failure, missing CP, etc.). Our catch here only fires on truly unexpected
+ * errors that escape the orchestrator itself.
+ */
+const STOCK_CRON_INTERVAL_SECONDS = 2 * 3600;   // 2 hours
+
+add_hook('AfterCronJob', 5, function ($vars) {
+    try {
+        $rateKey = 'stockrefresh:cron';
+        if (Cache::get($rateKey) !== null) {
+            return;
+        }
+        Cache::set($rateKey, 1, STOCK_CRON_INTERVAL_SECONDS);
+
+        (new StockControl)->recalculateAll();
+    } catch (Throwable $e) {
+        Log::insert('StockControl:AfterCronJob', [], $e->getMessage());
+    }
+});
+
+/**
+ * Post-provision: auto-accept the originating order and refresh stock.
+ *
+ * Fires after every successful VirtFusion CreateAccount. Two responsibilities,
+ * independent try/catch blocks so a failure in one doesn't short-circuit the other:
+ *
+ *   1. AUTO-ACCEPT — if the service's parent order is still 'Pending' (admin
+ *      hasn't manually accepted yet), call WHMCS's AcceptOrder API with
+ *      autosetup=false (we already provisioned, don't re-trigger CreateAccount).
+ *      This closes the loop for installs that rely on pending-order workflows
+ *      for non-VF products but want VF provisions to auto-advance.
+ *
+ *   2. STOCK REFRESH — a new VM just consumed memory/cpu/disk/IPv4 on the
+ *      target hypervisor group. Bust the grpres:{id} cache and recalculate
+ *      every stock-controlled product. A shared 30 s rate-limit key prevents
+ *      a burst of 10 parallel provisions from triggering 10 full recalcs.
+ *
+ * Filtering by moduletype='VirtFusionDirect' keeps this hook harmless for
+ * unrelated products that happen to share the WHMCS install.
+ */
+add_hook('AfterModuleCreate', 1, function ($vars) {
+    if (($vars['params']['moduletype'] ?? '') !== 'VirtFusionDirect') {
+        return;
+    }
+
+    // Part 1: auto-accept the originating order if still Pending.
+    try {
+        $serviceId = (int) ($vars['params']['serviceid'] ?? 0);
+        if ($serviceId > 0) {
+            $hosting = Capsule::table('tblhosting')->where('id', $serviceId)->first();
+            $orderId = $hosting ? (int) ($hosting->orderid ?? 0) : 0;
+            if ($orderId > 0) {
+                $order = Capsule::table('tblorders')->where('id', $orderId)->first();
+                if ($order && strcasecmp((string) $order->status, 'Pending') === 0) {
+                    $resp = localAPI('AcceptOrder', [
+                        'orderid' => $orderId,
+                        'autosetup' => false,   // already provisioned; don't re-run CreateAccount
+                        'sendemail' => true,
+                    ]);
+                    Log::insert(
+                        'AutoAcceptOrder',
+                        ['orderid' => $orderId, 'serviceid' => $serviceId],
+                        $resp,
+                    );
+                }
+            }
+        }
+    } catch (Throwable $e) {
+        Log::insert('AutoAcceptOrder:fail', ['serviceID' => $vars['params']['serviceid'] ?? null], $e->getMessage());
+    }
+
+    // Part 2: refresh stock (capacity just decreased).
+    try {
+        if (Cache::get('stockrefresh:event') === null) {
+            Cache::set('stockrefresh:event', 1, 30);
+
+            $groupId = (int) ($vars['params']['configoption1'] ?? 0);
+            if ($groupId > 0) {
+                Cache::forget('grpres:' . $groupId);
+            }
+
+            (new StockControl)->recalculateAll();
+        }
+    } catch (Throwable $e) {
+        Log::insert('StockControl:AfterModuleCreate', ['serviceID' => $vars['params']['serviceid'] ?? null], $e->getMessage());
+    }
+});
+
+/**
+ * Post-termination stock refresh.
+ *
+ * A destroyed VM just freed memory/cpu/disk/IPv4 on the target hypervisor group.
+ * Refresh so the storefront reflects the restored capacity immediately. Shares
+ * the 30 s rate-limit key with AfterModuleCreate — a provision-then-terminate in
+ * quick succession only triggers one full recalc.
+ */
+add_hook('AfterModuleTerminate', 1, function ($vars) {
+    if (($vars['params']['moduletype'] ?? '') !== 'VirtFusionDirect') {
+        return;
+    }
+
+    try {
+        if (Cache::get('stockrefresh:event') !== null) {
+            return;
+        }
+        Cache::set('stockrefresh:event', 1, 30);
+
+        $groupId = (int) ($vars['params']['configoption1'] ?? 0);
+        if ($groupId > 0) {
+            Cache::forget('grpres:' . $groupId);
+        }
+
+        (new StockControl)->recalculateAll();
+    } catch (Throwable $e) {
+        Log::insert('StockControl:AfterModuleTerminate', ['serviceID' => $vars['params']['serviceid'] ?? null], $e->getMessage());
+    }
+});
+
+/**
+ * Lazy stock refresh on order-flow cart pages.
+ *
+ * Keeps "hot" products fresh between daily cron runs without a polling loop: when a
+ * customer lands on a cart page for a specific product, we opportunistically recalculate
+ * that product's qty. If the upstream grpres:{id} cache is warm (populated in the last
+ * 120 s by an earlier view or the daily cron), recalculateForProduct does no HTTP calls
+ * and just re-writes the same qty — effectively free.
+ *
+ * WHY ClientAreaPageCart (not ClientAreaPageProductDetails)
+ * ---------------------------------------------------------
+ * ClientAreaPageProductDetails fires on the My Services → product-details view for an
+ * EXISTING service, which is the wrong place — the stock number only matters during
+ * pre-order. ClientAreaPageCart fires on every cart/order page (product browse, config,
+ * checkout) and WHMCS consults tblproducts.qty on each of those, so this is where a
+ * fresh number pays off.
+ *
+ * RATE LIMIT
+ * ----------
+ * 60 s per product (stockrefresh:{pid}). Short enough that a busy product refreshes
+ * near-continuously across viewers; long enough that two customers arriving within the
+ * same second don't trigger two identical DB UPDATEs. The pid check below filters this
+ * hook to only fire when a specific product is known — generic cart pages (templatefile=
+ * "cart.tpl") pass no pid and are no-ops.
+ */
+add_hook('ClientAreaPageCart', 1, function ($vars) {
+    try {
+        $productId = (int) ($vars['pid'] ?? $vars['productid'] ?? ($vars['productinfo']['pid'] ?? 0));
+        if ($productId <= 0) {
+            return null;
+        }
+
+        $rateKey = 'stockrefresh:' . $productId;
+        if (Cache::get($rateKey) !== null) {
+            return null;
+        }
+        Cache::set($rateKey, 1, 60);
+
+        (new StockControl)->recalculateForProduct($productId);
+    } catch (Throwable $e) {
+        Log::insert('StockControl:ClientAreaPageCart', ['pid' => $vars['pid'] ?? null], $e->getMessage());
+    }
+
+    return null;
+});
+
 /**
  * Shopping Cart Validation Hook
  *

modules/servers/VirtFusionDirect/lib/Module.php

@@ -56,6 +56,14 @@ use WHMCS\Database\Capsule;
  */
 class Module
 {
+    /**
+     * @var array|false|null Memoised catalogue-level CP connection used by fetchPackage/fetchGroupResources.
+     *                       Resolved via getCP(false, true) — "any available VirtFusion server" — on first use.
+     *                       Kept on the instance so a cron loop recalculating 20 products doesn't hit
+     *                       tblservers 20×N times when N stock helpers are called per product.
+     */
+    private $catalogueCp = null;
+
     /**
      * Initialises the module and ensures the database schema is up to date.
      */
@@ -1240,4 +1248,175 @@ class Module
     {
         return json_decode($response, true, 512, JSON_THROW_ON_ERROR);
     }
+
+    // =========================================================================
+    // Catalogue helpers — used by StockControl to size the WHMCS inventory from
+    // live VirtFusion data. Pre-order code path: CP is resolved via "any
+    // available server" since no service context exists yet.
+    // =========================================================================
+
+    /**
+     * Resolve the catalogue-level CP (any available VirtFusion server) and memoise.
+     *
+     * Stock calculations run from a cron loop or product-detail page view — there's
+     * no WHMCS service yet, so we can't dereference a specific panel via
+     * resolveServiceContext. "Any enabled server" is the correct fallback for read-only
+     * catalogue operations (package + hypervisor-group endpoints return the same data
+     * from every VirtFusion node on the same cluster).
+     *
+     * @return array{url: string, base_url: string, token: string}|false
+     */
+    private function getCatalogueCp()
+    {
+        if ($this->catalogueCp === null) {
+            $this->catalogueCp = $this->getCP(false, true);
+        }
+
+        return $this->catalogueCp;
+    }
+
+    /**
+     * Fetch a VirtFusion package by ID — the authoritative source for "how much RAM,
+     * CPU, and disk does one VPS of this product cost?".
+     *
+     * Return values distinguish confirmed-missing from transient failure:
+     *   array  — package data (fields: memory, cpuCores, primaryStorage, primaryStorageProfile, enabled, …)
+     *   false  — HTTP 404: package has been deleted in VirtFusion. Callers treat as OOS.
+     *   null   — Transient failure (no CP, network error, 5xx, malformed body). Callers must
+     *            NOT overwrite WHMCS qty on a null — that would zero out inventory during a blip.
+     *
+     * Success responses are cached 10 min (key "pkg:{id}") since package definitions
+     * rarely change; 404 responses get a short 60 s cache so an admin re-creating a
+     * deleted package doesn't have to wait ten minutes for stock to pick it up again.
+     *
+     * @param  int  $packageId  VirtFusion package ID (from tblproducts.configoption2).
+     * @return array|false|null
+     */
+    public function fetchPackage($packageId)
+    {
+        try {
+            $packageId = (int) $packageId;
+            if ($packageId <= 0) {
+                return null;
+            }
+
+            $cacheKey = 'pkg:' . $packageId;
+            $cached = Cache::get($cacheKey);
+            if ($cached !== null) {
+                // Sentinel marker for a previously-confirmed 404.
+                if (is_array($cached) && ! empty($cached['__notFound'])) {
+                    return false;
+                }
+
+                return $cached;
+            }
+
+            $cp = $this->getCatalogueCp();
+            if (! $cp) {
+                return null;
+            }
+
+            $request = $this->initCurl($cp['token']);
+            $data = $request->get($cp['url'] . '/packages/' . $packageId);
+            Log::insert(__FUNCTION__, $request->getRequestInfo(), $data);
+
+            $httpCode = (int) $request->getRequestInfo('http_code');
+
+            if ($httpCode === 200) {
+                $decoded = json_decode($data, true);
+                if (is_array($decoded)) {
+                    $package = $decoded['data'] ?? $decoded;
+                    if (is_array($package)) {
+                        Cache::set($cacheKey, $package, 600);
+
+                        return $package;
+                    }
+                }
+
+                return null;
+            }
+
+            if ($httpCode === 404) {
+                Cache::set($cacheKey, ['__notFound' => true], 60);
+
+                return false;
+            }
+
+            return null;
+        } catch (\Throwable $e) {
+            Log::insert(__FUNCTION__, [], $e->getMessage());
+
+            return null;
+        }
+    }
+
+    /**
+     * Fetch free/allocated resources for every hypervisor in a group — the live picture
+     * of how much headroom remains to place more VPSes.
+     *
+     * Same tri-state return contract as fetchPackage():
+     *   array  — decoded response with a 'data' array of per-hypervisor resource breakdowns.
+     *   false  — HTTP 404: group has been deleted. Callers may treat as "zero capacity from this group".
+     *   null   — Transient failure. Callers must NOT overwrite WHMCS qty on a null.
+     *
+     * Cache TTL is 120 s — short enough that customers don't see stale OOS labels for
+     * long after capacity frees up, and long enough to amortise the upstream call across
+     * bursty product-page traffic. Matches the traffic-stats TTL in getTrafficStats().
+     *
+     * @param  int  $groupId  VirtFusion hypervisor group ID.
+     * @return array|false|null
+     */
+    public function fetchGroupResources($groupId)
+    {
+        try {
+            $groupId = (int) $groupId;
+            if ($groupId <= 0) {
+                return null;
+            }
+
+            $cacheKey = 'grpres:' . $groupId;
+            $cached = Cache::get($cacheKey);
+            if ($cached !== null) {
+                if (is_array($cached) && ! empty($cached['__notFound'])) {
+                    return false;
+                }
+
+                return $cached;
+            }
+
+            $cp = $this->getCatalogueCp();
+            if (! $cp) {
+                return null;
+            }
+
+            $request = $this->initCurl($cp['token']);
+            $data = $request->get($cp['url'] . '/compute/hypervisors/groups/' . $groupId . '/resources');
+            Log::insert(__FUNCTION__, $request->getRequestInfo(), $data);
+
+            $httpCode = (int) $request->getRequestInfo('http_code');
+
+            if ($httpCode === 200) {
+                $decoded = json_decode($data, true);
+                if (is_array($decoded) && isset($decoded['data']) && is_array($decoded['data'])) {
+                    Cache::set($cacheKey, $decoded, 120);
+
+                    return $decoded;
+                }
+
+                return null;
+            }
+
+            if ($httpCode === 404) {
+                Cache::set($cacheKey, ['__notFound' => true], 60);
+
+                return false;
+            }
+
+            return null;
+        } catch (\Throwable $e) {
+            Log::insert(__FUNCTION__, [], $e->getMessage());
+
+            return null;
+        }
+    }
 }

modules/servers/VirtFusionDirect/lib/PowerDns/Client.php

@@ -128,7 +128,38 @@ class Client
                 return ['ok' => false, 'http' => 0, 'error' => $err];
             }
             if ($http === 401 || $http === 403) {
-                return ['ok' => false, 'http' => $http, 'error' => 'authentication failed (check API key)'];
+                // Three distinct causes all produce 401/403 here:
+                //   (a) Actual wrong API key — the #1 obvious cause.
+                //   (b) `api-allow-from` in PowerDNS config excludes the WHMCS
+                //       host's IP. PowerDNS rejects pre-auth in some configs,
+                //       producing 401/403 even with a valid key.
+                //   (c) Invisible whitespace in the stored key (fixed in Config
+                //       via trim(), but a pre-upgrade install might still have
+                //       a cached request dating from before the fix).
+                // Listing all three gives the operator a concrete checklist.
+                return [
+                    'ok' => false,
+                    'http' => $http,
+                    'error' => 'HTTP ' . $http . ' — PowerDNS rejected authentication. Check: ' .
+                        '(1) the X-API-Key matches the `api-key=` in PowerDNS config, ' .
+                        '(2) `api-allow-from=` includes this WHMCS host\'s IP, and ' .
+                        '(3) the key has no trailing whitespace/newlines (re-paste it if unsure).',
+                ];
+            }
+            if ($http === 404) {
+                // The endpoint reached PowerDNS (no 0/connection-refused) but the
+                // server ID path segment isn't known. By far the most common cause
+                // is an addon misconfiguration where someone entered the nameserver
+                // FQDN instead of the literal string "localhost" into the Server ID
+                // field. Surface that hypothesis directly — it's the single highest-
+                // probability fix and turns a mystery into an actionable error.
+                return [
+                    'ok' => false,
+                    'http' => 404,
+                    'error' => 'HTTP 404 — PowerDNS does not recognise server id "' . $this->serverId .
+                        '". This field should almost always be the literal string "localhost" ' .
+                        '(the PowerDNS API server identifier, NOT your nameserver hostname).',
+                ];
             }
 
             return ['ok' => false, 'http' => $http, 'error' => 'unexpected HTTP ' . $http . ': ' . substr((string) $body, 0, 200)];

modules/servers/VirtFusionDirect/lib/PowerDns/Config.php

@@ -119,23 +119,50 @@ class Config
             $config['cacheTtl'] = max(10, (int) ($rows['cacheTtl'] ?? 60));
 
             if (! empty($rows['apiKey'])) {
+                $raw = (string) $rows['apiKey'];
+                $decrypted = '';
+
                 try {
                     // decrypt() is WHMCS's global helper — matches how the VirtFusion
                     // bearer token is handled in Module::getCP().
-                    $decrypted = decrypt($rows['apiKey']);
-
-                    // Fallback to raw value if decrypt returned empty or non-string —
-                    // defends against the rare case where decrypt silently fails
-                    // (wrong encryption key at rest) or the value was inserted
-                    // manually as plaintext during development.
-                    $config['apiKey'] = is_string($decrypted) && $decrypted !== '' ? $decrypted : (string) $rows['apiKey'];
+                    $decrypted = (string) decrypt($raw);
                 } catch (\Throwable $e) {
                     // Even when decrypt throws, we try the raw value so a diagnostic
                     // path exists. Operator sees the decrypt error in the module log
                     // but isn't locked out of using the addon while they investigate.
-                    $config['apiKey'] = (string) $rows['apiKey'];
-                    Log::insert('PowerDns:Config', 'decrypt skipped', $e->getMessage());
+                    Log::insert('PowerDns:Config', 'decrypt threw', $e->getMessage());
                 }
+
+                // WHMCS addon module password-type fields are stored PLAINTEXT in
+                // tbladdonmodules.value (unlike tblservers.password which IS encrypted).
+                // When fed a plaintext input, WHMCS's decrypt() doesn't return empty
+                // or unchanged — it returns a short binary garbage string. If we used
+                // that as the API key we'd produce a baffling 401 from PowerDNS.
+                //
+                // Heuristic: an API key is printable ASCII by definition. If
+                // decrypt() produced non-printable output, we know it mangled a
+                // plaintext value and we should stick with raw. If decrypt()
+                // produced a different-but-printable string, it's a genuine
+                // decryption of an actually-encrypted value (unusual for addons,
+                // but some third-party setups do encrypt at rest).
+                //
+                // trim() handles another common foot-gun: admin UIs silently
+                // appending a newline on paste, which would land in the
+                // X-API-Key: header verbatim and also produce a 401.
+                $candidate = $raw;
+                if ($decrypted !== '' && $decrypted !== $raw && ctype_print($decrypted)) {
+                    $candidate = $decrypted;
+                } elseif ($decrypted !== '' && $decrypted !== $raw) {
+                    // Decrypt output wasn't printable — it's garbage from mangling
+                    // a plaintext input. Log once so the diagnostic trail is clear
+                    // but don't expose key material.
+                    Log::insert(
+                        'PowerDns:Config',
+                        'decrypt produced non-printable output; using raw',
+                        ['raw_len' => strlen($raw), 'dec_len' => strlen($decrypted)],
+                    );
+                }
+                $config['apiKey'] = trim($candidate);
             }
         } catch (\Throwable $e) {
             // Any DB-level failure (table doesn't exist, connection dropped, etc.)

modules/servers/VirtFusionDirect/lib/PowerDns/IpUtil.php

@@ -101,19 +101,30 @@ class IpUtil
     }
 
     /**
-     * Extract every host IP address (v4 and v6) from a VirtFusion server object.
+     * Extract every IP address and IPv6 subnet from a VirtFusion server object.
      *
      * Walks every interface, not just interfaces[0] (ServerResource only reads the primary).
-     * Handles both explicit `address` fields and `subnet`+`cidr` pairs.
-     * For IPv6 entries exposed only as `subnet`+`cidr`, the subnet base is used when
-     * the cidr is /128 (single host); otherwise the entry is skipped and reported.
+     * Returns three buckets:
+     *
+     *   addresses  — discrete host IPs (v4 always, v6 when the API exposes per-host records
+     *                or a /128 subnet entry). Each entry is a plain IP string.
+     *
+     *   subnets    — IPv6 subnet allocations (e.g. 2001:db8:0:5d::/64) where the module
+     *                cannot auto-discover individual host addresses. These are surfaced
+     *                so the client UI can show "here's your /64" and offer an "Add host PTR"
+     *                path where the customer types a specific address inside the subnet.
+     *                Each entry: ['subnet' => '2001:db8:0:5d::', 'cidr' => 64].
+     *
+     *   skipped    — malformed / unusable entries (non-IP, missing cidr, etc.) kept for
+     *                logging so we can diagnose schema drift in the VirtFusion API.
      *
      * @param  object|array  $serverObject  Raw VirtFusion server payload (may be wrapped in `data`)
-     * @return array{addresses: string[], skipped: array} Deduped IP strings + array of skipped entries with reasons
+     * @return array{addresses: string[], subnets: array<int, array{subnet: string, cidr: int}>, skipped: array}
      */
     public static function extractIps($serverObject): array
     {
         $addresses = [];
+        $subnets = [];
         $skipped = [];
 
         // Normalise object-or-array input. json_decode(json_encode($x), true) is the
@@ -123,7 +134,7 @@ class IpUtil
             $serverObject = json_decode(json_encode($serverObject), true);
         }
         if (! is_array($serverObject)) {
-            return ['addresses' => [], 'skipped' => []];
+            return ['addresses' => [], 'subnets' => [], 'skipped' => []];
         }
 
         // VirtFusion wraps the payload in a "data" key on GET responses but the stored
@@ -131,7 +142,7 @@ class IpUtil
         $data = $serverObject['data'] ?? $serverObject;
         $interfaces = $data['network']['interfaces'] ?? [];
         if (! is_array($interfaces)) {
-            return ['addresses' => [], 'skipped' => []];
+            return ['addresses' => [], 'subnets' => [], 'skipped' => []];
         }
 
         // Walk every interface (not just interfaces[0]). ServerResource only reads [0]
@@ -159,29 +170,91 @@ class IpUtil
                     continue;
                 }
 
-                // Fallback shape: VirtFusion sometimes exposes v6 only as subnet+cidr
-                // (common when a /64 is routed to the VPS and the OS auto-assigns
-                // specific host addresses). We can't set a PTR for the whole subnet,
-                // so we only accept /128 (single-host) entries and report the rest
-                // via the "skipped" channel so callers can surface a UI note.
+                // Subnet-with-cidr shape. VirtFusion's common v6 allocation model is
+                // to route a whole /64 to the VPS and let the OS auto-assign specific
+                // host addresses. The module can't know which host the customer
+                // actually uses, so we surface the subnet as a first-class entry and
+                // let the client UI offer an "Add host PTR" path with containment
+                // ownership verification.
                 $subnet = $v6['subnet'] ?? null;
                 $cidr = isset($v6['cidr']) ? (int) $v6['cidr'] : null;
-                if ($subnet && self::isIpv6($subnet)) {
+                if ($subnet && self::isIpv6($subnet) && $cidr !== null) {
                     if ($cidr === 128) {
+                        // Single-host "subnet" — treat as a discrete address.
                         $addresses[$subnet] = true;
+                    } elseif ($cidr > 0 && $cidr < 128) {
+                        // Genuine subnet allocation. Dedupe by (subnet, cidr) pair.
+                        $key = $subnet . '/' . $cidr;
+                        if (! isset($subnets[$key])) {
+                            $subnets[$key] = ['subnet' => $subnet, 'cidr' => $cidr];
+                        }
                     } else {
-                        $skipped[] = [
-                            'subnet' => $subnet,
-                            'cidr' => $cidr,
-                            'reason' => 'ipv6-subnet-without-explicit-host-address',
-                        ];
+                        $skipped[] = ['subnet' => $subnet, 'cidr' => $cidr, 'reason' => 'invalid-cidr'];
                     }
                 }
             }
         }
 
-        // array_keys gives us the de-duplicated list in insertion order.
-        return ['addresses' => array_keys($addresses), 'skipped' => $skipped];
+        return [
+            'addresses' => array_keys($addresses),
+            'subnets' => array_values($subnets),
+            'skipped' => $skipped,
+        ];
+    }
+
+    /**
+     * True if $ip falls inside the subnet $prefix/$cidrBits.
+     *
+     * Used for subnet-containment ownership checks when the customer wants to set
+     * a PTR for a specific host address inside an IPv6 subnet allocated to their
+     * VPS — we can't enumerate their assigned hosts, but we CAN prove the address
+     * they're claiming lies within one of their subnets.
+     *
+     * Works on the binary (inet_pton) representation so v6 notation differences
+     * (compression, case) don't affect the comparison.
+     *
+     * ALGORITHM
+     * ---------
+     *   1. Convert both IPs to 16 raw bytes via inet_pton (or 4 for v4).
+     *   2. Compare the first floor(cidr/8) bytes byte-wise (full-byte prefix).
+     *   3. If cidr isn't a multiple of 8, mask the next byte and compare bits.
+     *
+     * Example: 2001:db8::5 vs 2001:db8::/32
+     *   fullBytes = 32/8 = 4; first 4 bytes of both are 20:01:0d:b8 → match
+     *   remBits = 0 → no partial byte to compare
+     *   → true
+     */
+    public static function ipv6InSubnet(string $ip, string $subnetPrefix, int $cidrBits): bool
+    {
+        if (! self::isIpv6($ip) || ! self::isIpv6($subnetPrefix)) {
+            return false;
+        }
+        if ($cidrBits < 0 || $cidrBits > 128) {
+            return false;
+        }
+        $ipBin = @inet_pton($ip);
+        $subBin = @inet_pton($subnetPrefix);
+        if ($ipBin === false || $subBin === false) {
+            return false;
+        }
+
+        $fullBytes = intdiv($cidrBits, 8);
+        $remBits = $cidrBits % 8;
+
+        // Compare whole-byte prefix with a single substr compare.
+        if ($fullBytes > 0 && substr($ipBin, 0, $fullBytes) !== substr($subBin, 0, $fullBytes)) {
+            return false;
+        }
+
+        // Compare the partial byte at the cidr boundary, if any.
+        if ($remBits > 0) {
+            $mask = (0xFF << (8 - $remBits)) & 0xFF;
+            if ((ord($ipBin[$fullBytes]) & $mask) !== (ord($subBin[$fullBytes]) & $mask)) {
+                return false;
+            }
+        }
+
+        return true;
     }
 
     /**

modules/servers/VirtFusionDirect/lib/PowerDns/PtrManager.php

@@ -246,6 +246,22 @@ class PtrManager
             return $out;
         }
 
+        // Subnet-only rows come first so the client UI can render "you have a /64,
+        // here's how to add a host PTR inside it" above the discrete-IP list.
+        // These carry no PTR content themselves — they're informational anchors
+        // plus the "Add custom host" entry point.
+        foreach ($extracted['subnets'] as $s) {
+            $out[] = [
+                'ip' => null,
+                'subnet' => $s['subnet'],
+                'cidr' => $s['cidr'],
+                'ptr' => null,
+                'ttl' => null,
+                'zone' => null,
+                'status' => 'subnet-only',
+            ];
+        }
+
         foreach ($extracted['addresses'] as $ip) {
             try {
                 $loc = $this->locate($ip);

modules/servers/VirtFusionDirect/lib/StockControl.php

@@ -0,0 +1,537 @@
+<?php
+
+namespace WHMCS\Module\Server\VirtFusionDirect;
+
+use WHMCS\Database\Capsule as DB;
+
+/**
+ * Computes accurate stock quantities for VirtFusionDirect products and writes them
+ * to tblproducts.qty, leveraging WHMCS's native stock-control feature (badges,
+ * disabled Add-to-Cart, checkout block) instead of building parallel UI.
+ *
+ * HOW THE NUMBER IS DERIVED
+ * -------------------------
+ * For every product with tblproducts.stockcontrol=1:
+ *
+ *   qty = Σ groupCapacity(g, package, ipv4Req, bufferPct)  for every eligible group g
+ *
+ * where groupCapacity is computed from live /compute/hypervisors/groups/{id}/resources
+ * data and package is the VirtFusion /packages/{id} response — the authoritative
+ * per-VPS resource footprint. Each hypervisor's per-metric capacity is
+ * min(memory, cpu, storage), summed across hypervisors in the group; IPv4 is a
+ * group-level pool so its cap is taken as the per-hypervisor max within the group
+ * (not summed) to avoid double-counting.
+ *
+ * ELIGIBLE GROUPS
+ * ---------------
+ * The default group (tblproducts.configoption1) plus every value of the Location
+ * configurable option, if the product exposes one. Location is detected by matching
+ * the configurable option name against the "hypervisorId" label from
+ * config/ConfigOptionMapping.php (falls back to "Location") — same convention
+ * ModuleFunctions::createAccount() uses to map configoptions to VirtFusion fields.
+ * This lets a single product span multiple regions and still get a meaningful qty.
+ *
+ * ELIGIBLE HYPERVISORS
+ * --------------------
+ * enabled=true AND commissioned=true AND prohibit=false. Everything else is skipped
+ * with zero contribution to the group total.
+ *
+ * FAIL-SAFE INVARIANT
+ * -------------------
+ * CRITICAL: if the computation cannot complete (missing CP, transient API failure,
+ * malformed response, no groups resolved), recalculateForProduct() returns null and
+ * the caller MUST NOT touch tblproducts.qty. The reason: a false zero during a
+ * transient failure would pull every product out of the storefront, causing
+ * lost-order incidents that take human intervention to recover. Better to keep a
+ * slightly-stale qty than to silently take the catalogue offline.
+ *
+ * Confirmed-missing cases (package 404 or package.enabled=false) DO return 0 —
+ * that's the right answer, the product genuinely cannot be provisioned.
+ *
+ * CACHING
+ * -------
+ * Packages cached 10 min (rarely change), group resources cached 120 s (change
+ * meaningfully minute-to-minute under load). Both handled inside Module's
+ * fetchPackage / fetchGroupResources helpers, keyed 'pkg:{id}' / 'grpres:{id}' so
+ * multiple products in a cron sweep share cached data for the same upstream call.
+ */
+class StockControl
+{
+    /** Default mapping from internal VF key → WHMCS configurable-option label.
+     *  Kept in sync with $configOptionDefaultNaming in ModuleFunctions::createAccount(). */
+    private const DEFAULT_OPTION_LABELS = [
+        'ipv4' => 'IPv4',
+        'packageId' => 'Package',
+        'hypervisorId' => 'Location',
+        'storage' => 'Storage',
+        'memory' => 'Memory',
+        'traffic' => 'Bandwidth',
+        'networkSpeedInbound' => 'Inbound Network Speed',
+        'networkSpeedOutbound' => 'Outbound Network Speed',
+        'cpuCores' => 'CPU Cores',
+        'networkProfile' => 'Network Type',
+        'storageProfile' => 'Storage Type',
+    ];
+
+    /** @var Module Shared for its CP memoisation + initCurl/fetchPackage/fetchGroupResources helpers. */
+    private $module;
+
+    /** @var array<string,string>|null Resolved per-request once. */
+    private $optionLabelMap = null;
+
+    public function __construct(?Module $module = null)
+    {
+        // Dependency-inject for testability; default wires up a real Module so production
+        // callers (hooks.php, admin.php) don't have to know about the dependency.
+        $this->module = $module ?? new Module;
+    }
+
+    // -----------------------------------------------------------------------
+    // Public API
+    // -----------------------------------------------------------------------
+
+    /**
+     * Recalculate qty for every VirtFusionDirect product that has WHMCS stock control enabled.
+     *
+     * Called from the every-2-hour AfterCronJob safety-net hook, from the post-provision
+     * and post-termination event hooks in hooks.php, and from the admin stockRecalculate
+     * AJAX endpoint in admin.php. Returns a map of productId => resulting qty (or null
+     * where the product was skipped / left untouched), useful for the admin endpoint's
+     * JSON response and for per-event logging.
+     *
+     * @return array<int,int|null>
+     */
+    public function recalculateAll(): array
+    {
+        $results = [];
+
+        try {
+            $products = DB::table('tblproducts')
+                ->where('servertype', 'VirtFusionDirect')
+                ->where('stockcontrol', 1)
+                ->get();
+
+            foreach ($products as $product) {
+                $results[(int) $product->id] = $this->recalculateForProduct((int) $product->id);
+            }
+        } catch (\Throwable $e) {
+            Log::insert('StockControl:recalculateAll', [], $e->getMessage());
+        }
+
+        return $results;
+    }
+
+    /**
+     * Recalculate qty for a single product.
+     *
+     * Returns the new qty on success, or null on any unrecoverable failure — in which case
+     * tblproducts.qty is left unchanged (fail-safe invariant).
+     */
+    public function recalculateForProduct(int $productId): ?int
+    {
+        try {
+            $product = DB::table('tblproducts')->where('id', $productId)->first();
+            if (! $product) {
+                return null;
+            }
+            if ($product->servertype !== 'VirtFusionDirect') {
+                return null;
+            }
+            if ((int) $product->stockcontrol !== 1) {
+                // Stock control disabled on this product — don't manage qty.
+                return null;
+            }
+
+            $qty = $this->computeQtyForProduct($product);
+            if ($qty === null) {
+                // Transient / unrecoverable — preserve existing qty.
+                return null;
+            }
+
+            DB::table('tblproducts')
+                ->where('id', $productId)
+                ->update(['qty' => (int) $qty]);
+
+            Log::insert(
+                'StockControl:recalculate',
+                [
+                    'productId' => $productId,
+                    'packageId' => (int) $product->configoption2,
+                    'defaultGroupId' => (int) $product->configoption1,
+                ],
+                ['qty' => $qty],
+            );
+
+            return $qty;
+        } catch (\Throwable $e) {
+            Log::insert('StockControl:recalculateForProduct', ['productId' => $productId], $e->getMessage());
+
+            return null;
+        }
+    }
+
+    // -----------------------------------------------------------------------
+    // Computation
+    // -----------------------------------------------------------------------
+
+    /**
+     * Compute the qty integer without touching the DB.
+     *
+     * @param  object  $product  tblproducts row.
+     * @return int|null Non-negative qty, or null when the computation cannot complete.
+     */
+    private function computeQtyForProduct($product): ?int
+    {
+        $productId = (int) $product->id;
+
+        $packageId = (int) $product->configoption2;
+        if ($packageId <= 0) {
+            Log::insert(
+                'StockControl:compute',
+                ['productId' => $productId],
+                'no packageId in configoption2 — skipped',
+            );
+
+            return null;
+        }
+
+        $package = $this->module->fetchPackage($packageId);
+        if ($package === null) {
+            // Transient — preserve qty.
+            return null;
+        }
+        if ($package === false) {
+            // Confirmed 404: package deleted in VirtFusion. Product is unfulfillable.
+            Log::insert(
+                'StockControl:compute',
+                ['productId' => $productId, 'packageId' => $packageId],
+                'package 404 — qty forced to 0',
+            );
+
+            return 0;
+        }
+        if (empty($package['enabled'])) {
+            Log::insert(
+                'StockControl:compute',
+                ['productId' => $productId, 'packageId' => $packageId],
+                'package disabled in VirtFusion — qty forced to 0',
+            );
+
+            return 0;
+        }
+
+        $groupIds = $this->resolveHypervisorGroupIds($product);
+        if (empty($groupIds)) {
+            Log::insert(
+                'StockControl:compute',
+                ['productId' => $productId],
+                'no hypervisor groups resolved — qty untouched',
+            );
+
+            return null;
+        }
+
+        $ipv4Required = max(1, (int) ($product->configoption3 ?? 1));
+        $bufferPct = $this->bufferPctForProduct($product);
+
+        $total = 0;
+        foreach ($groupIds as $groupId) {
+            $resources = $this->module->fetchGroupResources($groupId);
+            if ($resources === null) {
+                // Transient failure on any group aborts the whole computation — we can't
+                // safely reduce qty to a partial total and risk under-reporting stock.
+                return null;
+            }
+            if ($resources === false) {
+                // Group 404 — deleted; contributes 0. Keep going so other eligible groups still count.
+                Log::insert(
+                    'StockControl:compute',
+                    ['productId' => $productId, 'groupId' => $groupId],
+                    'group 404 — contributing 0 capacity',
+                );
+
+                continue;
+            }
+
+            $total += $this->groupCapacity($resources, $package, $ipv4Required, $bufferPct);
+        }
+
+        return max(0, $total);
+    }
+
+    /**
+     * Sum of per-hypervisor minimums (mem/cpu/storage), capped by the group-level IPv4 pool.
+     *
+     * IPv4 CAP IS MAX-WITHIN-GROUP, NOT SUMMED
+     * ----------------------------------------
+     * network.total.ipv4.free in the API is a group-level pool visible from every hypervisor
+     * in the group — the same number is reported on each. Summing per-hypervisor IPv4 caps
+     * would overcount the pool by the hypervisor count. Taking max() within a group, then
+     * summing across groups, reflects the real constraint.
+     */
+    private function groupCapacity(array $resources, array $package, int $ipv4Required, float $bufferPct): int
+    {
+        $hypervisors = $resources['data'] ?? [];
+        if (! is_array($hypervisors) || empty($hypervisors)) {
+            return 0;
+        }
+
+        $hypMinSum = 0;
+        $ipv4CapForGroup = 0;
+
+        foreach ($hypervisors as $h) {
+            $hyp = $h['hypervisor'] ?? [];
+            if (empty($hyp['enabled']) || empty($hyp['commissioned']) || ! empty($hyp['prohibit'])) {
+                continue;
+            }
+
+            $res = $h['resources'] ?? [];
+            if (! is_array($res)) {
+                continue;
+            }
+
+            $memCap = self::capFor($res['memory'] ?? null, (int) ($package['memory'] ?? 0), $bufferPct);
+            $cpuCap = self::capFor($res['cpuCores'] ?? null, (int) ($package['cpuCores'] ?? 0), $bufferPct);
+            $storeCap = self::capForStorage(
+                $res,
+                (int) ($package['primaryStorageProfile'] ?? 0),
+                (int) ($package['primaryStorage'] ?? 0),
+                $bufferPct,
+            );
+
+            $hypMinSum += min($memCap, $cpuCap, $storeCap);
+
+            $ipv4Free = (int) ($res['network']['total']['ipv4']['free'] ?? 0);
+            if ($ipv4Free > 0) {
+                $ipv4Cap = intdiv($ipv4Free, max(1, $ipv4Required));
+                if ($ipv4Cap > $ipv4CapForGroup) {
+                    $ipv4CapForGroup = $ipv4Cap;
+                }
+            }
+        }
+
+        // If no hypervisor reported any ipv4 data (unusual but defensible), don't let
+        // the cap kill an otherwise-valid count — treat as "no IPv4 constraint known".
+        if ($ipv4CapForGroup === 0) {
+            foreach ($hypervisors as $h) {
+                if (isset($h['resources']['network']['total']['ipv4']['free'])) {
+                    // There WAS an ipv4 value (possibly 0); the cap is genuinely 0.
+                    return 0;
+                }
+            }
+
+            // No ipv4 data anywhere in the response → don't apply the cap.
+            return max(0, $hypMinSum);
+        }
+
+        return min($hypMinSum, $ipv4CapForGroup);
+    }
+
+    /**
+     * How many VPSes fit into a single (free, max, buffer) cell for one resource.
+     *
+     * Handles three edge cases consistent with live API behaviour:
+     *   - need <= 0        → unlimited fit (nothing consumed for this dimension)
+     *   - resource.max = 0 → unlimited quota; free can be negative but we don't care
+     *   - negative/zero available after buffer → 0 (clamp; never negative qty)
+     */
+    private static function capFor($resource, int $need, float $bufferPct): int
+    {
+        if ($need <= 0) {
+            return PHP_INT_MAX;
+        }
+        if (! is_array($resource)) {
+            return 0;
+        }
+
+        $max = (int) ($resource['max'] ?? 0);
+        $free = (int) ($resource['free'] ?? 0);
+
+        if ($max === 0) {
+            // Unlimited quota — buffer doesn't apply (X% of 0 is 0).
+            return PHP_INT_MAX;
+        }
+
+        $reserve = (int) ceil(((float) $max) * ($bufferPct / 100.0));
+        $available = $free - $reserve;
+
+        if ($available <= 0) {
+            return 0;
+        }
+
+        return intdiv($available, $need);
+    }
+
+    /**
+     * Storage variant of capFor() that respects the package's primaryStorageProfile.
+     *
+     * Rules:
+     *   - profileId > 0  → must match an otherStorage[].id on the hypervisor; if the
+     *                      matched pool is disabled or missing, this hypervisor has
+     *                      zero storage capacity for this product (can't place there).
+     *   - profileId <= 0 → fall back to localStorage. If local is disabled, 0.
+     */
+    private static function capForStorage(array $res, int $profileId, int $needGb, float $bufferPct): int
+    {
+        if ($needGb <= 0) {
+            return PHP_INT_MAX;
+        }
+
+        if ($profileId > 0) {
+            foreach ($res['otherStorage'] ?? [] as $pool) {
+                if ((int) ($pool['id'] ?? 0) !== $profileId) {
+                    continue;
+                }
+                if (empty($pool['enabled'])) {
+                    return 0;
+                }
+
+                return self::capFor(
+                    ['max' => (int) ($pool['max'] ?? 0), 'free' => (int) ($pool['free'] ?? 0)],
+                    $needGb,
+                    $bufferPct,
+                );
+            }
+
+            // Storage profile not present on this hypervisor — cannot place the VM.
+            return 0;
+        }
+
+        $local = $res['localStorage'] ?? null;
+        if (is_array($local) && ! empty($local['enabled'])) {
+            return self::capFor(
+                ['max' => (int) ($local['max'] ?? 0), 'free' => (int) ($local['free'] ?? 0)],
+                $needGb,
+                $bufferPct,
+            );
+        }
+
+        return 0;
+    }
+
+    /**
+     * The admin-tunable safety buffer (configoption7), clamped to [0, 100].
+     *
+     * Default is 10% when the field is blank or non-numeric — reserves 10% of each
+     * resource's max so we stop selling a product before the hypervisor is literally
+     * at 100%, which is where placement timing issues and fragmentation start biting.
+     * Admins can override per product (including down to 0) in the module settings.
+     */
+    private function bufferPctForProduct($product): float
+    {
+        $raw = $product->configoption7 ?? '';
+        if ($raw === null || $raw === '') {
+            return 10.0;
+        }
+        $val = is_numeric($raw) ? (float) $raw : 10.0;
+
+        return max(0.0, min(100.0, $val));
+    }
+
+    // -----------------------------------------------------------------------
+    // Hypervisor-group resolution
+    // -----------------------------------------------------------------------
+
+    /**
+     * Collect every hypervisor group ID this product could be provisioned into:
+     * the default (configoption1) plus every numeric value of the "Location"
+     * configurable option (if one is attached).
+     *
+     * @return int[] Deduplicated list of group IDs, strictly positive.
+     */
+    private function resolveHypervisorGroupIds($product): array
+    {
+        $groups = [];
+
+        $defaultGroup = (int) ($product->configoption1 ?? 0);
+        if ($defaultGroup > 0) {
+            $groups[] = $defaultGroup;
+        }
+
+        $locationLabel = $this->optionLabelFor('hypervisorId');
+        if ($locationLabel !== null && $locationLabel !== '') {
+            foreach ($this->fetchConfigurableOptionValues((int) $product->id, $locationLabel) as $value) {
+                $asInt = (int) $value;
+                if ($asInt > 0) {
+                    $groups[] = $asInt;
+                }
+            }
+        }
+
+        return array_values(array_unique($groups));
+    }
+
+    /**
+     * Look up every sub-option value for a given configurable option name on a product.
+     *
+     * WHMCS stores option names as either "Location" or "Location|Display Override" —
+     * this method normalises both by comparing just the part before the pipe.
+     *
+     * @return array<int,string> Raw sub-option names (callers decide numeric parsing).
+     */
+    private function fetchConfigurableOptionValues(int $productId, string $label): array
+    {
+        try {
+            $options = DB::table('tblproductconfiglinks as l')
+                ->join('tblproductconfigoptions as o', 'o.gid', '=', 'l.gid')
+                ->where('l.pid', $productId)
+                ->select('o.id', 'o.optionname')
+                ->get();
+
+            $matchedIds = [];
+            foreach ($options as $opt) {
+                $name = (string) $opt->optionname;
+                $pipe = strpos($name, '|');
+                if ($pipe !== false) {
+                    $name = substr($name, 0, $pipe);
+                }
+                if ($name === $label) {
+                    $matchedIds[] = (int) $opt->id;
+                }
+            }
+
+            if (empty($matchedIds)) {
+                return [];
+            }
+
+            return DB::table('tblproductconfigoptionssub')
+                ->whereIn('configid', $matchedIds)
+                ->pluck('optionname')
+                ->toArray();
+        } catch (\Throwable $e) {
+            Log::insert('StockControl:fetchConfigurableOptionValues', ['productId' => $productId, 'label' => $label], $e->getMessage());
+
+            return [];
+        }
+    }
+
+    /**
+     * Resolve the WHMCS configurable-option label for an internal key, respecting
+     * config/ConfigOptionMapping.php overrides — same contract as ModuleFunctions::createAccount().
+     */
+    private function optionLabelFor(string $key): ?string
+    {
+        if ($this->optionLabelMap === null) {
+            $this->optionLabelMap = self::DEFAULT_OPTION_LABELS;
+
+            try {
+                // Resolve the mapping file directly relative to this class — avoids
+                // depending on WHMCS's ROOTDIR, which isn't defined when the module
+                // is loaded outside a full WHMCS request (cron tooling, tests).
+                // __DIR__ is .../modules/servers/VirtFusionDirect/lib, so the config
+                // directory is one level up.
+                $overridePath = dirname(__DIR__) . '/config/ConfigOptionMapping.php';
+                if (is_file($overridePath)) {
+                    $override = require $overridePath;
+                    if (is_array($override)) {
+                        $this->optionLabelMap = array_merge($this->optionLabelMap, $override);
+                    }
+                }
+            } catch (\Throwable $e) {
+                // Swallow — mapping override is best-effort; defaults still work.
+            }
+        }
+
+        return $this->optionLabelMap[$key] ?? null;
+    }
+}

modules/servers/VirtFusionDirect/templates/css/module.css

@@ -545,3 +545,32 @@
     .vf-rdns-edit { flex-direction: column; align-items: stretch; }
     .vf-rdns-msg { padding-left: 0; }
 }
+
+/* Subnet-only rows (IPv6 /64 allocations). Distinct visual treatment so
+   customers see "this is a subnet, not a host" without reading the badge. */
+.vf-rdns-subnet-row {
+    background: rgba(23, 162, 184, 0.04);
+    border-left: 3px solid #17a2b8;
+    padding-left: 8px;
+}
+.vf-rdns-subnet-form {
+    flex-basis: 100%;
+    padding: 10px 0 0 180px;
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+}
+.vf-rdns-subnet-inputs {
+    display: flex;
+    gap: 6px;
+    flex-wrap: wrap;
+}
+.vf-rdns-subnet-actions {
+    display: flex;
+    gap: 6px;
+    align-items: center;
+}
+@media (max-width: 768px) {
+    .vf-rdns-subnet-form { padding-left: 0; }
+    .vf-rdns-subnet-inputs { flex-direction: column; }
+}

modules/servers/VirtFusionDirect/templates/js/module.js

@@ -1117,7 +1117,8 @@ var VF_RDNS_STATUS = {
     "missing":      { label: "no PTR",      bg: "#6c757d", fg: "#fff" },
     "no-zone":      { label: "no zone",     bg: "#dc3545", fg: "#fff" },
     "error":        { label: "error",       bg: "#dc3545", fg: "#fff" },
-    "disabled":    { label: "disabled",    bg: "#6c757d", fg: "#fff" }
+    "disabled":     { label: "disabled",    bg: "#6c757d", fg: "#fff" },
+    "subnet-only":  { label: "subnet",      bg: "#17a2b8", fg: "#fff" }
 };
 
 function vfRdnsBadge(status) {
@@ -1157,6 +1158,19 @@ function vfRenderRdnsPanel(serviceId, systemUrl, ips) {
         return;
     }
     ips.forEach(function (row) {
+        // Subnet-only rows (IPv6 /64 allocations) render as a distinct informational
+        // anchor with an expandable "Add host PTR" form — the customer types a
+        // specific address inside the subnet + hostname, backend verifies containment.
+        if (row.status === "subnet-only") {
+            list.append(vfRenderSubnetRow(serviceId, systemUrl, row));
+            return;
+        }
+        list.append(vfRenderIpRow(serviceId, systemUrl, row));
+    });
+}
+
+/** Standard per-IP row with inline PTR editor. Used for v4 addresses + discrete v6 hosts. */
+function vfRenderIpRow(serviceId, systemUrl, row) {
     var wrap = $('<div class="vf-rdns-row"></div>');
     var ipLabel = $('<div class="vf-rdns-ip"></div>').text(row.ip);
     var badge = vfRdnsBadge(row.status);
@@ -1175,12 +1189,65 @@ function vfRenderRdnsPanel(serviceId, systemUrl, ips) {
     });
 
     var editor = $('<div class="vf-rdns-edit"></div>').append(input).append(saveBtn);
-        wrap.append(ipLabel).append(editor).append(badge).append(msg);
-        list.append(wrap);
-    });
+    return wrap.append(ipLabel).append(editor).append(badge).append(msg);
 }
 
-function vfUpdateRdns(serviceId, systemUrl, ip, input, saveBtn, msg, badge) {
+/**
+ * Subnet-only row: shows "2602:2f3:0:5d::/64" with a collapsible "Add host PTR" form.
+ *
+ * Why collapsed by default: most customers won't set custom v6 PTRs, so burying
+ * the form until explicitly requested keeps the panel uncluttered for the common
+ * case. Adding a host PTR is a power-user operation (needs a pre-existing AAAA
+ * record) so surfacing it as a secondary action is UX-appropriate.
+ */
+function vfRenderSubnetRow(serviceId, systemUrl, row) {
+    var wrap = $('<div class="vf-rdns-row vf-rdns-subnet-row"></div>');
+    var label = $('<div class="vf-rdns-ip"></div>').text(row.subnet + "/" + row.cidr);
+    var badge = vfRdnsBadge(row.status);
+
+    var toggleBtn = $('<button type="button" class="btn btn-sm btn-outline-secondary">+ Add host PTR</button>');
+    var form = $('<div class="vf-rdns-subnet-form" style="display:none;"></div>');
+
+    var ipInput = $('<input type="text" class="form-control form-control-sm vf-rdns-input" placeholder="Host IPv6 address inside this subnet (e.g. 2602:2f3:0:5d::10)">');
+    var ptrInput = $('<input type="text" class="form-control form-control-sm vf-rdns-input" maxlength="253" placeholder="Hostname for PTR (e.g. mail.example.com)">');
+    var addBtn = $('<button type="button" class="btn btn-sm btn-primary">Add PTR</button>');
+    var cancelBtn = $('<button type="button" class="btn btn-sm btn-link">Cancel</button>');
+    var msg = $('<div class="vf-rdns-msg"></div>');
+
+    toggleBtn.on("click", function () {
+        form.toggle();
+        toggleBtn.text(form.is(":visible") ? "− Hide" : "+ Add host PTR");
+    });
+    cancelBtn.on("click", function () {
+        form.hide();
+        toggleBtn.text("+ Add host PTR");
+        ipInput.val(""); ptrInput.val(""); msg.hide();
+    });
+
+    addBtn.on("click", function () {
+        var ip = (ipInput.val() || "").trim();
+        var ptr = (ptrInput.val() || "").trim();
+        if (!ip) { msg.text("Enter a host IPv6 address.").css("color", "#dc3545").show(); return; }
+        if (!ptr) { msg.text("Enter a hostname for the PTR.").css("color", "#dc3545").show(); return; }
+        // Same server-side validation guards apply; we reuse the normal update flow.
+        vfUpdateRdns(serviceId, systemUrl, ip, ptrInput, addBtn, msg, null, function () {
+            // On success, refresh the whole panel so the new host PTR shows up as its own row
+            // alongside the subnet it came from.
+            setTimeout(function () { vfLoadRdns(serviceId, systemUrl); }, 1500);
+        });
+    });
+    ipInput.on("keydown", function (e) { if (e.key === "Enter") { e.preventDefault(); ptrInput.focus(); } });
+    ptrInput.on("keydown", function (e) { if (e.key === "Enter") { e.preventDefault(); addBtn.click(); } });
+
+    var inputsRow = $('<div class="vf-rdns-subnet-inputs"></div>').append(ipInput).append(ptrInput);
+    var actionsRow = $('<div class="vf-rdns-subnet-actions"></div>').append(addBtn).append(cancelBtn);
+    form.append(inputsRow).append(actionsRow).append(msg);
+
+    var editorWrap = $('<div class="vf-rdns-edit"></div>').append(toggleBtn);
+    return wrap.append(label).append(editorWrap).append(badge).append(form);
+}
+
+function vfUpdateRdns(serviceId, systemUrl, ip, input, saveBtn, msg, badge, onSuccess) {
     var ptr = (input.val() || "").trim();
     // Light client-side regex mirrors the server-side one — strict enforcement is on the server.
     if (ptr !== "" && !/^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}\.?$/.test(ptr)) {
@@ -1201,12 +1268,17 @@ function vfUpdateRdns(serviceId, systemUrl, ip, input, saveBtn, msg, badge) {
             var verb = (ptr === "") ? "deleted" : "saved";
             msg.text("rDNS " + verb + ".").css("color", "#28a745").show();
             setTimeout(function () { msg.fadeOut(); }, 2500);
+            // Badge may be null (e.g. when called from the subnet row's Add-PTR form
+            // which has no per-row badge to update). Guard rather than crash.
+            if (badge) {
                 // Optimistically update the badge; a background refresh will correct it.
                 if (ptr === "") {
                     badge.replaceWith(vfRdnsBadge("missing"));
                 } else {
                     badge.replaceWith(vfRdnsBadge("ok"));
                 }
+            }
+            if (typeof onSuccess === "function") { onSuccess(); }
         } else {
             var err = (resp && resp.errors) ? resp.errors : "Save failed.";
             msg.text(err).css("color", "#dc3545").show();