---
title: "Cross Domain Access"
url: https://docs.catalyst.zoho.com/en/sdk/web/v4/cloud-scale/authentication/cross-domain-access/
description: "This page describes the method to authenticte your backend and frontend servvices when they are hosted in different domains"
last_updated: 2026-09-08T11:07:33Z
service: Cloud Scale
type: general
related_links:
  - name: "JavaScript SDK"
    url: /en/sdk/javascript/v1/cloudscale/authentication/add-user-to-org/
  - name: "Authentication"
    url: /en/cloud-scale/help/authentication/introduction
  - name: "Cross Domain Access Help Doc"
    url: /en/cloud-scale/help/authentication/cross-domain-access/
---

# Authenticate Backend Requirements for Frontend Services

> **Note:** This SDK is currently in deprecation. Migrate to [JavaScript SDK](https://docs.catalyst.zoho.com/en/sdk/javascript/v1/overview/) now.

The `generateAuthToken()` SDK method will generate the required token to validate backend invocation calls made from the frontend services; when the backend and front services are hosted in different domains.

> **Notes:**

* You need to ensure that the backend and frontend services though hosted on different hosting services are part of the same Catalyst project.

* You must ensure you have whitelisted the domains of the backend and frontend services using the **CORS** feature present in Catalyst Authentication. You can find out more about the CORS feature from this [help documentation](https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/whitelisting/authorized-domains/introduction/#cors).

* The `generateAuthToken()` SDK method is available from Web SDK version v4.6.1.

```javascript

    var auth = catalyst.auth;
    auth.generateAuthToken().then((response) => {
            const token = response.access_token;   // the required user token will be shared as value in the response
});

```