> For the complete documentation index, see [llms.txt](https://docs.limio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.limio.com/api/authentication.md).

# Authentication

Get an OAuth Bearer token with the client credentials flow, and send it with each request.

Most operations need an OAuth Bearer token. Your server gets the token with the OAuth client credentials flow, with no user. The token gives full read and write access to the API of your environment.

## Get your credentials

To get a `client_id` and a `client_secret`, contact [Limio Support](mailto:support@limio.com?subject=Request%20for%20API%20client%20credentials). Give the URL of your Limio environment, for example `https://acme.prod.limio.com`.

Keep the `client_secret` on your server. Do not put it in code that runs in a browser or in a mobile app.

## Get a token

Send a `POST` request to `https://<hostname>/oauth2/token`, as `application/x-www-form-urlencoded`. `<hostname>` is the hostname of your environment, for example `acme.prod.limio.com` (EU hosting) or `acme.prod-us.limio.com` (US hosting).

| Form parameter  | Value                |
| --------------- | -------------------- |
| `grant_type`    | `client_credentials` |
| `client_id`     | Your `client_id`     |
| `client_secret` | Your `client_secret` |

```bash
curl --request POST \
  --url https://acme.prod.limio.com/oauth2/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data client_id="$LIMIO_CLIENT_ID" \
  --data client_secret="$LIMIO_CLIENT_SECRET"
```

The response gives the token and its lifetime in seconds:

```json
{
  "access_token": "<token>",
  "token_type": "Bearer",
  "expires_in": 3600
}
```

When the token expires, send the same request again to get a new token.

## Send the token

Send the token in the `Authorization` header of each request:

```
Authorization: Bearer <token>
```

If the token is missing, not valid or expired, the API returns `401`.

## API keys (legacy)

Three deprecated catalog reads, `/products`, `/pages` and `/segments`, also accept a publishable API key. Limio is moving all operations to OAuth Bearer tokens, so use a Bearer token for a new integration.

A publishable API key gives read-only access to the catalog, so code that runs in a browser can use it. Send the key in the `Authorization` header with no `Bearer` prefix.

To make a key, log in to Limio and go to **Profile > Developers > Limio Keys**. Then click **Generate New**. Each account can have two keys. To delete a key, click **Delete** next to it. A deleted key stops working at once, and you cannot restore it.


---

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