# Update Customer Custom Columns

**Table of Contents**

### Overview  
In order to update the custom columns of an existing customer, you can consume the endpoint presented in this article. In order to consume it, you must:

- Be authenticated user

For information on how you can authenticate, see: [Authentication](https://developer.sellercloud.com/dev-article/authentication/)

As soon as you do authentication and receive a valid token, it needs to be passed to the service call.

### Endpoint  
Example for such endpoint for **TT** server is:

`https://tt.api.sellercloud.com/rest/api/Customers/{customerId}/CustomColumns`

For your server endpoint will be:

`https://{your_server_id}.api.sellercloud.com/rest/api/Customers/{customerId}/CustomColumns`

### Request  
Information about expected request parameters can be found on swagger UI [https://tt/api.sellercloud.com/rest/swagger](https://tt/api.sellercloud.com/rest/swagger).

- Method Type: **HttpPut**  
- Authorization: Use **Bearer Token** (where ‘Token’ is the token received from token authentication)  
- Header info: **Content-Type: application/json**  
- Parameters: Id of existing customer  
- Request Body:

```json
{
  "CustomColumns": [
    {
      "ColumnName": "string",
      "Value": "string"
    }
  ]
}
```

|     |     |     |     |
| --- | --- | --- | --- |
| **Parameter** | **Data Type** | **Description** | **Is Required** |
| CustomColumns | List | List of custom columns to update | true |
| ColumnName | string | Custom column name | true |
| Value | string | Custom column new value | true |

### Response  
- If user is authenticated and update is successful, then response will be **Status Code 200 => OK**  
- If user is not authenticated, then response will be **Status Code 401 => Not Valid Token**  
- In case of error, response will be **Status Code 500 => Internal Server Error**