---
title: "Implementation"
url: https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/whitelisting/authorized-domains/implementation/
description: "Custom User Validation allows you to validate user sign ups using custom logic"
last_updated: 2026-08-28T06:26:16Z
service: Cloud Scale
type: general
---

# Implementation

To access the *Whitelisting* section you have to configure at least one of the [authentication types](https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/authentication-types/): [Hosted](https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/native-catalyst-authentication/hosted-authentication-type/introduction/), [Embedded](https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/native-catalyst-authentication/embedded-authentication/introduction/), or [Third-party](https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/third-party-authentication/introduction/). 

You can access *Authorized Domains* in the whitelisting section any time by navigating to **Cloud Scale > Authentication** in the console, and clicking the **Whitelisting** option.

![cloud_scale_authentication_whitelisting](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_whitelisting.webp)

You can also access *Authorized Domains* in the *Additional Settings* section during the last step of all the authentication setups.
![cloud_scale_additional_settings](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_additional_settings.webp)

### To Enable CORS and iFrame

Similar to [Custom User Validation](https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/whitelisting/custom-user-validation/implementation/), Authorized Domains is also disabled by default.

To authorize domains and enable CORS and iFrame access:

1. Click **Add Domain** under the *Authorized Domain* section.
![cloud_scale_authentication_authorized_domains_addomain_highlights](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_addomain_highlight.webp)

2. Enter the name of the domain name, and authorize the domain to have CORS and or iFrame access by enabling the respective options, as per your preference.
![cloud_scale_authentication_authorized_domains_adding](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_adding.webp)

3. Click **Configure** to complete set up.

The authorized domain along with the enabled status of CORS and iFrame access to your application will be displayed.

![cloud_scale_authentication_authorized_domains_single_domain](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_single_domain.webp)

You can authorize and add more domains by clicking **Add Domain** and repeating the above mentioned steps.
![cloud_scale_authentication_authorized_domains_multiple_domain_highlight](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_multiple_domain_highlight.webp)

### To Modify Domain Name or Update CORS and iFrame Access to Your Application

You can modify a domain name or reconfigure its CORS and iFrame access to your application in the following way:

1. Click the **ellipsis icon** next to the domain you wish to change, and click **Edit**.
![cloud_scale_authentication_authorized_domains_edit](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_edit.webp)

2. You can update the domain name, and enable or disable CORS and iFrame access as per your preference in the pop-up window. Click **Update** to confirm the update.
![cloud_scale_authentication_authorized_domains_update](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_update.webp)

You can now view the updated information of the domain in the **Authorized Domains** section.
![cloud_scale_authentication_authorized_domains_updated](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_updated.webp)

### To Delete an Authorized Domain

You can permanently delete a domain that you authorized in the following way:

1. Click the **ellipsis icon** next to the domain you wish to delete, and click **Delete**.
![cloud_scale_authentication_authorized_domains_delete](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_delete.webp)

2. Click **Yes, Proceed** in the confirmation pop-up.
![cloud_scale_authentication_authorized_domains_delete_confirm](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_delete_confirm.webp)

The domain will be deleted.

![cloud_scale_authentication_authorized_domains_deleted](https://catalyst-docs-development.zohostratus.in/images/help/authentication/cloud_scale_authentication_authorized_domains_deleted.webp)