Enhance WHMCS integration with mTLS support and product mapping features. Added mTLS configuration options, updated API endpoints for mTLS status and fingerprint registration, and implemented product validation API. Updated database schema and documentation accordingly.

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

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+<div class="panel panel-default">
+  <div class="panel-heading"><h3 class="panel-title">Product mappings</h3></div>
+  <div class="panel-body">
+    <p>
+      <a href="{{modulelink}}" class="btn btn-default">Dashboard</a>
+      <a href="{{modulelink}}&action=mappings" class="btn btn-primary">Mappings</a>
+      <a href="{{modulelink}}&action=mtls" class="btn btn-default">mTLS</a>
+    </p>
+
+    <h4>Add or update mapping</h4>
+    <form method="post" action="{{modulelink}}&action=save_mapping" class="form-horizontal">
+      <div class="form-group">
+        <label class="col-sm-3 control-label">WHMCS product</label>
+        <div class="col-sm-9">
+          <select name="whmcs_product_id" class="form-control" required>
+            {{mappings.product_options}}
+          </select>
+        </div>
+      </div>
+      <div class="form-group">
+        <label class="col-sm-3 control-label">GameCloud plan slug</label>
+        <div class="col-sm-9">
+          <select name="plan_slug" class="form-control" required>
+            {{mappings.plan_options}}
+          </select>
+        </div>
+      </div>
+      <div class="form-group">
+        <label class="col-sm-3 control-label">Default version</label>
+        <div class="col-sm-9"><input type="text" name="default_version" value="1.21.1" class="form-control"></div>
+      </div>
+      <div class="form-group">
+        <label class="col-sm-3 control-label">Default software</label>
+        <div class="col-sm-9">
+          <select name="default_software" class="form-control">
+            <option>VANILLA</option><option>PAPER</option><option>PURPUR</option>
+          </select>
+        </div>
+      </div>
+      <div class="form-group">
+        <div class="col-sm-offset-3 col-sm-9">
+          <label><input type="checkbox" name="is_active" value="1" checked> Active</label>
+        </div>
+      </div>
+      <div class="form-group">
+        <div class="col-sm-offset-3 col-sm-9">
+          <button type="submit" class="btn btn-success">Save mapping</button>
+        </div>
+      </div>
+    </form>
+
+    <h4>Current mappings</h4>
+    <table class="table table-bordered">
+      <thead><tr><th>Product ID</th><th>Name</th><th>Plan</th><th>Software</th><th>Active</th><th></th></tr></thead>
+      <tbody>{{mappings.rows}}</tbody>
+    </table>
+  </div>
+</div>