---
title: "Refresh Access Token"
url: https://docs.catalyst.zoho.com/en/api/oauth2/refresh-access-token/
description: "Learn about the OAuth 2.0 industry-standard protocol adhered by Catalyst that authenticates and authorizes API requests made by users to gain secure access to protected Catalyst resources."
last_updated: 2025-11-19T15:07:41Z
service: All Services
type: api
---

<!-- Leftcontent -->

# Step 4: Refresh Access Token

### Request Execution

When an `access\_token` expires, you must use the `refresh\_token` to generate
a new `access\_token` for your application.

To do so, send a `POST` request to the following URL with the params given below:

`https:<span></span>//accounts.zoho.com/oauth/v2/token?`

> **Note:** You must access the respective domains for the other [data centers](https://docs.catalyst.zoho.com/en/api/introduction/multi-dc-support/#Multi-DCSupport): 
* **EU:** `https://<span></span>accounts.zoho.eu/`
* **AU:** `https://<span></span>accounts.zoho.au/`
* **IN:** `https://<span></span>accounts.zoho.in/` 
* **CA:** `https://<span></span>accounts.zohocloud.ca/`
* **JP:** `https://<span></span>accounts.zohocloud.jp/` 
* **SA:** `https://<span></span>accounts.zohocloud.sa/` 

<table class="content-table">
  <thead>
    <tr>
      <th class="w30p">Parameter</th>
      <th class="w70p">Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>`refresh_token`*</td>
      <td>
        The `refresh_token` obtained in the previous step
      </td>
    </tr>
    <tr>
      <td>`client_id`*</td>
      <td>The Client ID that was generated during the client registration</td>
    </tr>
    <tr>
      <td>`client_secret`*</td>
      <td>
        The Client Secret that was generated during the client registration
      </td>
    </tr>
    <tr>
      <td>`grant_type`*</td>
      <td>
        `refresh_token` (Provide this literal string as the
        value)
      </td>
    </tr>
    <tr>
      <td>`redirect_uri`*</td>
      <td>
        One of the Authorized Redirect URIs you provided while registering the
        client in the previous step. You must not provide an unregistered
        redirect URI.
      </td>
    </tr>
  </tbody>
</table>

> **Note:** Fields marked with \* are mandatory.

<!-- Rightcontent -->

**Sample Request**

```bash
https://accounts.zoho.com/oauth/v2/token?refresh_token=1000.8ecdxxxxxxxxxxxxxxxxx.4638xxxxxxxxxxxxxxxxx&client_id=1000.0SRSxxxxxxxxxxxxxxx&client_secret=xxxxxxxxxxxxxxxxxxxxxxxx&redirect_uri=http://www.zoho.com/catalyst&grant_type=refresh_token
```

**Sample Response**

```json

    {
        "access_token": "{new_access_token}",
        "expires_in": 3600,
        "api_domain": "https://www.zohoapis.com",
        "token_type": "Bearer"
    }
```