use subscriptionid as code

serviceAddon.php

@@ -178,6 +178,12 @@ function serviceAddon_AdminServicesTabFields($params) {
 }
 
 function serviceAddon_ClientArea($params) {
+    return array(
+        'tabOverviewReplacementTemplate' => 'templates/clientarea',
+        'vars' => [
+            'subscriptionid' => $params['model']->subscriptionid
+        ],
+    );
 }
 
 function serviceAddonGetEmailTemplatesArray() {