> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tonder.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Get User ID

Before creating a withdrawal, you need a `user_id` in the Tonder system. This endpoint allows you to get or create a user ID.

<Warning>
  **Authentication Required**

  This endpoint requires authentication. Include the `Authorization` header with your API token in every request. See [Authentication requirements](/withdrawals-api/integration-security) for details.
</Warning>

## Endpoint

```http theme={null}
POST /customer/
```

## Request Body

| Parameter    | Type   | Required | Description            |
| ------------ | ------ | -------- | ---------------------- |
| `email`      | string | Yes      | Customer email address |
| `first_name` | string | Yes      | Customer first name    |
| `last_name`  | string | Yes      | Customer last name     |
| `phone`      | string | Yes      | Customer phone number  |

## Request Example

```json theme={null}
{
  "email": "testidcustomer@testuser.com",
  "first_name": "Paco",
  "last_name": "Fernandez",
  "phone": "8161234567"
}
```

## Response

The API returns the user information including the `id` and `auth_token`:

```json theme={null}
{
  "id": 6165,
  "email": "testidcustomer@testuser.com",
  "auth_token": "fa2a7cbcbbcb6d00e745651c6e21fd6cc5c6a26b",
  "first_name": "Paco",
  "last_name": "Fernandez"
}
```

<Info>
  **Save the User ID**

  Save the `id` field from the response. You'll need this `user_id` when creating withdrawal requests.
</Info>

## cURL Example

```bash theme={null}
curl -X POST https://stage.tonder.io/api/v1/customer/ \
  -H "Authorization: Token YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "testidcustomer@testuser.com",
    "first_name": "Paco",
    "last_name": "Fernandez",
    "phone": "8161234567"
  }'
```

<Note>
  **Postman Users**

  In Postman, add the `Authorization` header manually:

  * **Key**: `Authorization`
  * **Value**: `Token YOUR_API_KEY` (replace with your actual token from the Developers section)

  Replace `YOUR_API_KEY` with the token provided in the Developers section of the Tonder platform.
</Note>

## Next Steps

* Use the returned `id` as the `user_id` when [creating a withdrawal](/withdrawals-api/guides/create-withdrawal)
* Learn about [authentication requirements](/withdrawals-api/integration-security)