> ## 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

* To get started with our APIs, use the endpoint below to generate an Access Token with your API credentials or authorization code.
* The Access Token is a Bearer token to be included in the Authorization Header of all API requests
* Multiple tokens may be generated and each is valid for 15 minutes, or 900 seconds

# Endpoint

* `POST https://api.criteo.com/oauth2/token` Generate an Access Token

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

# Parameters

| Parameter              | Description                                                                                                              |
| ---------------------- | ------------------------------------------------------------------------------------------------------------------------ |
| `client_id` string     | Please see below for instructions on getting your credentials through [Developer Dashboard](https://partners.criteo.com) |
| `client_secret` string | Please see below for instructions on getting your credentials through [Developer Dashboard](https://partners.criteo.com) |
| `grant_type` string    | Must be `client_credentials` or `authorization_code`                                                                     |
| `code` string          | **Only for Authorization Code apps**. Authorization code returned during redirection                                     |
| `redirect_uri` string  | **Only for Authorization Code apps**. Must match the `redirect_uri` used for the authorization request.                  |

# Generate an Access Token

* This endpoint generates a new access token using your API credentials or authorization code.
* To comply with the OAuth2 standards of using client\_credentials, Criteo API authorization supports Content-Type: 'application/x-www-form-urlencoded'. See the example below.

```http theme={null}
POST https://api.criteo.com/oauth2/token
```

<CodeGroup>
  ```json JSON theme={null}
  // Sample Request
    
  curl --location --request POST 'https://api.criteo.com/oauth2/token'   --header 'Content-Type: application/x-www-form-urlencoded'   --data-urlencode 'client_id=CLIENT_ID'   --data-urlencode 'client_secret=CLIENT_SECRET'   --data-urlencode 'grant_type=client_credentials'
   
  // Sample Response
    
  {
      "access_token": "eyJhbGciOiJSUzI1NiIsImtpZCI6IkVuTTBCZkFELUFrNXZwOU9RMW1ZWXR6T2RaMUVad2RWaHY5T3Z2cVA3YVUiLCJ0eXAiOiJKV1QifQ.eyJjdHg6dXNlcjpkaXNwbGF5TmFtZSI6IkJvYmJ5IFNpYW8gTGVpIEhhbiIsImN0eDp1c2VyOmVtYWlsIjoiYi5oYW5AY3JpdGVvLmNvbSIsImN0eDp1c2VyOnVpZCI6ImIuaGFuIiwiY3R4OnVzZXI6dW1zSWQiOiIzMjM4ODQiLCJzdWIiOiJ1Omk6Yi5oYW5AY3JpdGVvLmNvbSIsImlhdCI6MTYwMTQwNDM1NSwiZXhwIjoxNjAxNDA1MzE1LCJhZGQ6bWFwaTp1bmFtZSI6ImIuaGFuIiwic2NvcGUiOiJnYXRld2F5IiwiY2xpZW50X2lkIjoiYi5oYW4iLCJuYmYiOjE2MDE0MDQ0MTUsImlzcyI6ImNyaXRlby1leGFtb2F1dGgifQ.OI1W8utCbR2a2VbkxOZZaP2JyQ4b8Kf9R2x_yGRp9jjqclvm8huC_iHb9AECLmYVMUYWojvmbIOk0j0BRfLf1xYoOAIvNbcWN-SsrkYOXVh9mYruwOfKJb0t6j8MW7u03PbfvSRtn_29ar3V-7rimDqdMR_iTVhTlBLI0W3jSOCjzKK9sbg0REwtneBu4V3dFLaLNIxXj5EtyaTpLB3v71smFljBHtUC1Go8wRUX2P_GZfWYJCZhatx0xsN46oS8aGQl3a6N4nh4cqdJNA83Y44LYEKpky0ZmBwC9D5j9rpC-BDkUaeWlgkVSicy6yWh-S06JC4e3pJwUHskUMvoiA",
      "token_type": "Bearer",
      "expires_in": 900
  }
  ```
</CodeGroup>

<Warning>
  **Mandatory Content-Type header**

  Please ensure you include Content-Type: application/x-www-form-urlencoded header in your call to /oauth2/token endpoint.
</Warning>

# Use an Access Token

* Once you have obtained your access token, you can authenticate all subsequent requests by including an `Authorization` HTTP header, as in the example below:

<CodeGroup>
  ```bash Bash theme={null}
  GET
  https://api.criteo.com/2020-10/advertisers/me

  Authorization: Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IkVuTTBCZkFELUFrNXZwOU9RMW1ZWXR6T2RaMUVad2RWaHY5T3Z2cVA3YVUiLCJ0eXAiOiJKV1QifQ.eyJjdHg6dXNlcjpkaXNwbGF5TmFtZSI6IkJvYmJ5IFNpYW8gTGVpIEhhbiIsImN0eDp1c2VyOmVtYWlsIjoiYi5oYW5AY3JpdGVvLmNvbSIsImN0eDp1c2VyOnVpZCI6ImIuaGFuIiwiY3R4OnVzZXI6dW1zSWQiOiIzMjM4ODQiLCJzdWIiOiJ1Omk6Yi5oYW5AY3JpdGVvLmNvbSIsImlhdCI6MTYwMTQwNDM1NSwiZXhwIjoxNjAxNDA1MzE1LCJhZGQ6bWFwaTp1bmFtZSI6ImIuaGFuIiwic2NvcGUiOiJnYXRld2F5IiwiY2xpZW50X2lkIjoiYi5oYW4iLCJuYmYiOjE2MDE0MDQ0MTUsImlzcyI6ImNyaXRlby1leGFtb2F1dGgifQ.OI1W8utCbR2a2VbkxOZZaP2JyQ4b8Kf9R2x_yGRp9jjqclvm8huC_iHb9AECLmYVMUYWojvmbIOk0j0BRfLf1xYoOAIvNbcWN-SsrkYOXVh9mYruwOfKJb0t6j8MW7u03PbfvSRtn_29ar3V-7rimDqdMR_iTVhTlBLI0W3jSOCjzKK9sbg0REwtneBu4V3dFLaLNIxXj5EtyaTpLB3v71smFljBHtUC1Go8wRUX2P_GZfWYJCZhatx0xsN46oS8aGQl3a6N4nh4cqdJNA83Y44LYEKpky0ZmBwC9D5j9rpC-BDkUaeWlgkVSicy6yWh-S06JC4e3pJwUHskUMvoiA
  Accept: text/plain
  Content-Type: application/*+json
  ```
</CodeGroup>

<Info>
  **OAuth Flow**

  You can find more details about how to implement OAuth flow for the different authentication methods in [OAuth implementation](/marketing-solutions/v2023.10/docs/oauth-implementation) guides.
</Info>