frontend user-identity method

fern/docs/pages/sdks/web/user-identity.mdx

 Using the `rev_info` method, you can generate and recognize a user within the DevRev system by providing relevant user details. This method enables you to convey information systematically, ensuring alignment between your DevRev CRM and the structured data model. For information regarding terminologies, click [here](https://devrev.ai/docs/product/grow). 
 Ensure you copy your access token, as you will not be able to view it again. 
 Using the `rev_info` method, you can generate and recognize a user within the DevRev system by providing relevant user details. This method enables you to convey information systematically, ensuring alignment between your DevRev CRM and the structured data model. For information regarding terminologies, click [here](https://devrev.ai/docs/product/grow). 
@@ -120,3 +120,46 @@ const sessionToken = '<SESSION_TOKEN>'
         })})();
 </script>
 ```
+
+## Identify users without session token
+
+You can also pass the identifiers in the `plugSDK.init` option without generating the session token.
+
+<Callout intent="note">
+This frontend user identification, by its nature, is not secure as the data is transmitted through the client side. It is recommended to use the session token method to securely identify users.
+</Callout>
+
+<Callout intent="warning">
+This method is currently in beta and comes with the following limitations:
+- Unverified users cannot be converted or merged into verified users.
+- An external reference used by an unverified user cannot be reused for any other user.
+</Callout>
+
+```jsx
+window.plugSDK.init({
+  app_id: '<your_unique_app_id>',
+  identity: {
+    user_ref: string;
+    user_traits?: { // optional
+      custom_fields?: object; // optional
+      display_name?: string; // optional
+      email?: string; // optional
+      phone_numbers?: string[]; // optional
+    }
+  }
+})
+```
+
+You can add or update the data in `user_traits` by using the `updateIdentity` method on the PLuG SDK. Attached is a sample code snippet for the same. 
+
+```jsx
+window.plugSDK.updateIdentity({
+  user_traits: {
+    custom_fields?: object; // optional
+    display_name?: string; // optional
+    email?: string; // optional
+    phone_numbers?: string[]; // optional
+  }
+})
+```
+