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

# Authentication

export const EndpointBadge = ({method = "GET", children}) => {
  const METHOD_STYLES = {
    GET: {
      bg: "mint-bg-[#2AB673]"
    },
    POST: {
      bg: "mint-bg-[#3064E3]"
    },
    PUT: {
      bg: "mint-bg-[#C28C30]"
    },
    PATCH: {
      bg: "mint-bg-[#DA622B]"
    },
    DELETE: {
      bg: "mint-bg-[#CB3A32]"
    },
    API: {
      bg: "mint-bg-black"
    }
  };
  const key = method.toUpperCase();
  const styles = METHOD_STYLES[key] ?? METHOD_STYLES.API;
  return <div className="relative mt-7">
      <span className={`absolute -top-2 -left-2 z-10 ${styles.bg} text-white px-2.5 py-0.5 rounded-full text-xs font-bold tracking-wide`}>
        {key}
      </span>
      {children}
    </div>;
};

# Introduction

* To get started with our APIs, use the endpoint below to generate an Access Token with your API credentials.

* The access token is a Bearer token to be included in the Authorization Header of all API requests.

* Multiple tokens may be generated, each valid for 15 minutes or 900 seconds.

***

# Endpoint

<EndpointBadge method="post">
  ```http theme={null}
  https://api.criteo.com/oauth2/token
  ```
</EndpointBadge>

<Info>
  **Note**

  Generate another access token when it expires, signaled by a `401 Unauthorized` HTTP status code
</Info>

***

# Parameters

<table>
  <thead>
    <tr>
      <th>
        <p>
          Parameter
        </p>
      </th>

      <th>
        <p>
          Description
        </p>
      </th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>
        <p>
          <code>
            client\_id
          </code>
        </p>
      </td>

      <td>
        <p>
          Set up your API credentials through our Developer Portal
        </p>
      </td>
    </tr>

    <tr>
      <td>
        <p>
          <code>
            client\_secret
          </code>
        </p>
      </td>

      <td>
        <p>
          Set up your API credentials through our Developer Portal
        </p>
      </td>
    </tr>

    <tr>
      <td>
        <p>
          <code>
            grant\_type
          </code>
        </p>
      </td>

      <td>
        <p>
          Must be

          <code>
            client\_credentials
          </code>

          or

          <code>
            authorization\_code
          </code>
        </p>
      </td>
    </tr>
  </tbody>
</table>

For more info, check [OAuth App Implementation](/retail-media/v2025.10/docs/oauth-app-implementation)

***

# Generate an Access Token

* This endpoint generates a new access token using your API credentials

<EndpointBadge method="post">
  ```http theme={null}
  https://api.criteo.com/oauth2/token
  ```
</EndpointBadge>

### Sample Request

```bash theme={null}
curl -X POST "https://api.criteo.com/oauth2/token" \
    -d 'client_id={client_id}' \
    -d 'client_secret={client_secret}' \
    -d 'grant_type=client_credentials'
```

### Sample Response

```json theme={null}
{
    "access_token": "&lt;TOKEN STRING&gt;",
    "token_type": "Bearer",
    "expires_in": 900
}
```

## What's next

* [API Response](/retail-media/v2025.10/docs/api-response)
* [API Pattern](/retail-media/v2025.10/docs/api-pattern)
* [Bulk Calls](/retail-media/v2025.10/docs/bulk-calls)
* [Campaign Structure](/retail-media/v2025.10/docs/campaign-structure)
* [List of Endpoints](/retail-media/v2025.10/docs/list-of-endpoints-including-preferred-deals)
* [Rate Limits](/retail-media/v2025.10/docs/rate-limits)
* [Statuses](/retail-media/v2024.10/docs/status)