diff --git a/application-licensing-licensor/application-licensing-licensor-api/src/main/java/com/xwiki/licensing/internal/upgrades/NewExtensionVersionAvailableManager.java b/application-licensing-licensor/application-licensing-licensor-api/src/main/java/com/xwiki/licensing/internal/upgrades/NewExtensionVersionAvailableManager.java
index a7d8d390..323b82d6 100644
--- a/application-licensing-licensor/application-licensing-licensor-api/src/main/java/com/xwiki/licensing/internal/upgrades/NewExtensionVersionAvailableManager.java
+++ b/application-licensing-licensor/application-licensing-licensor-api/src/main/java/com/xwiki/licensing/internal/upgrades/NewExtensionVersionAvailableManager.java
@@ -79,42 +79,40 @@ public void checkLicensedExtensionsAvailableVersions()
             InstalledExtension installedExtension = installedRepository.getInstalledExtension(extensionId);
             Collection<String> namespaces = installedExtension.getNamespaces();
             if (namespaces == null) {
-                notifyExtensionAvailableVersion(installedExtension.getId(), null);
+                notifyExtensionVersionAvailable(installedExtension.getId(), null);
             } else {
                 for (String namespace : installedExtension.getNamespaces()) {
-                    notifyExtensionAvailableVersion(installedExtension.getId(), namespace);
+                    notifyExtensionVersionAvailable(installedExtension.getId(), namespace);
                 }
             }
         }
-
     }
 
-    private void notifyExtensionAvailableVersion(ExtensionId extensionId, String namespace)
+    private void notifyExtensionVersionAvailable(ExtensionId extensionId, String namespace)
     {
         InstalledExtension installedExtension =
             installedRepository.getInstalledExtension(extensionId.getId(), namespace);
+        // Get the list of versions that can be installed, with the first one being the most recent.
         List<Version> installableVersions = upgradeExtensionHandler.getInstallableVersions(installedExtension.getId());
-        if (installableVersions.size() <= 0) {
+        if (installableVersions.isEmpty()) {
             return;
         }
 
         List<String> newVersionNotifiedExtensions = new ArrayList<>(licensingConfig.getNewVersionNotifiedExtensions());
         String namespaceName = namespace != null ? namespace : "root";
-        // Create an identified for the extension, by consider also the version and namespace.
-        String verifiedExtensionId =
+        // Create an identifier for the extension, by consider also the version and namespace.
+        String currentExtensionId =
             String.format("%s-%s-%s", extensionId.getId(), namespaceName, installableVersions.get(0));
 
-        if (!newVersionNotifiedExtensions.contains(verifiedExtensionId)) {
-            newVersionNotifiedExtensions.add(verifiedExtensionId);
+        if (!newVersionNotifiedExtensions.contains(currentExtensionId)) {
+            newVersionNotifiedExtensions.add(currentExtensionId);
             licensingConfig.setNewVersionNotifiedExtensions(newVersionNotifiedExtensions);
 
-            String message =
-                String.format("%s - %s - %s", installedExtension.getName(), namespaceName, installableVersions.get(0));
-            this.observationManager
-                .notify(
-                    new NewExtensionVersionAvailableEvent(
-                        new ExtensionId(extensionId.getId(), installableVersions.get(0)), namespace),
-                    extensionId.getId(), message);
+            String message = String.format("{\"extensionName\":\"%s\", \"namespace\": \"%s\", \"version\": \"%s\"}",
+                installedExtension.getName(), namespaceName, installableVersions.get(0));
+            this.observationManager.notify(
+                new NewExtensionVersionAvailableEvent(new ExtensionId(extensionId.getId(), installableVersions.get(0)),
+                    namespace), extensionId.getId(), message);
         }
     }
 }
diff --git a/application-licensing-licensor/application-licensing-licensor-api/src/main/resources/templates/newVersionAvailable.vm b/application-licensing-licensor/application-licensing-licensor-api/src/main/resources/templates/newVersionAvailable.vm
index 0d317d3e..2035e40b 100644
--- a/application-licensing-licensor/application-licensing-licensor-api/src/main/resources/templates/newVersionAvailable.vm
+++ b/application-licensing-licensor/application-licensing-licensor-api/src/main/resources/templates/newVersionAvailable.vm
@@ -4,14 +4,13 @@
 #set ($smallIcon = "arrow_up")
 #set ($compositeEventDate = $escapetool.xml($datetool.whenIs($event.dates.get(0))))
 
-#macro (getExtensionUpgradeURL $event)
-  ## The event body contains information about the extension id, version and targeted namespace.
-  #set ($extensionInfo = $event.getBody().split(' - '))
-  #set ($extensionNamespace = "#if ($extensionInfo[1] == 'root')$xcontext.mainWikiName#{else}$extensionInfo[1]#end")
+#macro (getExtensionUpgradeURL $extensionInfo)
+  #set ($extensionNamespace =
+    "#if ($extensionInfo.namespace == 'root')$xcontext.mainWikiName#{else}$extensionInfo.namespace#end")
   #set ($queryParams = $escapetool.url({
     'section': 'XWiki.Extensions',
     'extensionId': $event.getApplication(),
-    'extensionVersion': $extensionInfo[2],
+    'extensionVersion': $extensionInfo.version,
     'extensionNamespace': $extensionNamespace
   }))
   $xwiki.getURL($services.model.createDocumentReference($xcontext.mainWikiName, 'XWiki', 'XWikiPreferences'),
@@ -23,9 +22,12 @@
     <td>
       <span class="notification-event-user">$escapetool.xml($event.user.name)</span>
     </td>
-    ## The notification message is stored directly on the event body.
+    ## The event body contains information about the extension name, version and targeted namespace.
+    #set ($extensionInfo = $jsontool.fromString($event.getBody()))
     <td class="description">
-      <a href="#getExtensionUpgradeURL($event)">$escapetool.xml($event.getBody())</a>
+      <a href="#getExtensionUpgradeURL($extensionInfo)">
+        $extensionInfo.extensionName - $extensionInfo.namespace - $extensionInfo.version
+      </a>
     </td>
     <td class="text-right text-muted">$escapetool.xml($datetool.whenIs($event.date))</td>
   </tr>