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

integrations/whmcs/modules/addons/hexagamecloud/templates/dashboard.tpl

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+<div class="panel panel-default">
+  <div class="panel-heading">
+    <h3 class="panel-title">HexaHost GameCloud — Dashboard</h3>
+  </div>
+  <div class="panel-body">
+    <p>
+      <a href="{{modulelink}}" class="btn btn-default">Dashboard</a>
+      <a href="{{modulelink}}&action=events" class="btn btn-default">Events</a>
+      <a href="{{modulelink}}&action=reconciliation" class="btn btn-default">Reconciliation</a>
+      <a href="{{modulelink}}&action=poll" class="btn btn-primary">Poll events now</a>
+    </p>
+
+    <div class="row">
+      <div class="col-md-3">
+        <div class="well text-center">
+          <h4>{{health.status}}</h4>
+          <small>API status</small>
+        </div>
+      </div>
+      <div class="col-md-3">
+        <div class="well text-center">
+          <h4>{{stats.linkedServices}}</h4>
+          <small>Linked services</small>
+        </div>
+      </div>
+      <div class="col-md-3">
+        <div class="well text-center">
+          <h4>{{unlinkedWhmcsServices}}</h4>
+          <small>Unlinked WHMCS services</small>
+        </div>
+      </div>
+      <div class="col-md-3">
+        <div class="well text-center">
+          <h4>{{stats.pendingEvents}}</h4>
+          <small>Pending GameCloud events</small>
+        </div>
+      </div>
+    </div>
+
+    <table class="table table-striped">
+      <tbody>
+        <tr><th>Addon version</th><td>{{version}}</td></tr>
+        <tr><th>Integration ID</th><td>{{stats.integrationId}}</td></tr>
+        <tr><th>Billing provider</th><td>{{stats.billingProvider}}</td></tr>
+        <tr><th>Linked clients</th><td>{{stats.linkedClients}}</td></tr>
+        <tr><th>Open reconciliation issues</th><td>{{stats.openReconciliationIssues}}</td></tr>
+        <tr><th>Dead-letter events</th><td>{{stats.deadLetterEvents}}</td></tr>
+        <tr><th>Usage exports</th><td>{{stats.exportedUsagePeriods}}</td></tr>
+        <tr><th>Last reconciliation</th><td>{{stats.lastReconciliationAt}}</td></tr>
+        <tr><th>Last event sync</th><td>{{stats.lastEventSyncAt}}</td></tr>
+        <tr><th>Last error</th><td>{{lastError}}</td></tr>
+      </tbody>
+    </table>
+  </div>
+</div>

integrations/whmcs/modules/addons/hexagamecloud/templates/events.tpl

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+<div class="panel panel-default">
+  <div class="panel-heading">
+    <h3 class="panel-title">GameCloud Events</h3>
+  </div>
+  <div class="panel-body">
+    <p>
+      <a href="{{modulelink}}" class="btn btn-default">Dashboard</a>
+      <a href="{{modulelink}}&action=poll" class="btn btn-primary">Poll &amp; auto-ack</a>
+    </p>
+    <p>Pending local copies: <strong>{{pendingCount}}</strong> · Dead letter: <strong>{{deadLetterCount}}</strong></p>
+    <table class="table table-bordered table-condensed">
+      <thead>
+        <tr>
+          <th>ID</th>
+          <th>Type</th>
+          <th>Status</th>
+          <th>Payload</th>
+          <th>Created</th>
+          <th>Actions</th>
+        </tr>
+      </thead>
+      <tbody>
+        {{events.rows}}
+      </tbody>
+    </table>
+  </div>
+</div>

integrations/whmcs/modules/addons/hexagamecloud/templates/reconciliation.tpl

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+<div class="panel panel-default">
+  <div class="panel-heading">
+    <h3 class="panel-title">Reconciliation</h3>
+  </div>
+  <div class="panel-body">
+    <p>
+      <a href="{{modulelink}}" class="btn btn-default">Dashboard</a>
+      <a href="{{modulelink}}&action=reconciliation&run=1&dry=1" class="btn btn-default">Dry run</a>
+      <a href="{{modulelink}}&action=reconciliation&run=1&repair=1" class="btn btn-warning">Live + auto-repair</a>
+    </p>
+
+    {{reconciliation.result}}
+
+    <h4>Recent runs</h4>
+    <table class="table table-bordered table-condensed">
+      <thead>
+        <tr>
+          <th>Run ID</th>
+          <th>Mode</th>
+          <th>Issues</th>
+          <th>Created</th>
+        </tr>
+      </thead>
+      <tbody>
+        {{reconciliation.rows}}
+      </tbody>
+    </table>
+  </div>
+</div>