# Setting up an client credentials application

## Client Credential  
Log in to the Criteo Partners Portal and create a new app by clicking the ➕ button in the `My apps` section.

This opens a modal where you can choose the type of application.

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### Step 1. Create app  
#### App details  
1. Provide your app name and description. Please make sure to use a clearly identifiable name for your app, as it can be of great help with troubleshooting later on. Optionally, add an image to identify your application. On your app page, you can define the scope of your application and the OAuth parameters. For more details on defining your app scope, check [Create Your API Application](https://developers.criteo.com/criteo-apis/docs/create-your-app).
2. Upon clicking `Create new key`, the `client ID` and `client secret` will be generated and made available as a downloadable .txt file.

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#### Authentication method  
1. Select your app’s authentication method: choose between “ _Client Credentials_” or “ _Authorization Code_”.
2. For this setup, we are selecting “ _Client Credentials_”, but you can review our [OAuth App implementation](https://developers.criteo.com/criteo-apis/docs/oauth-app-implementation) guide to determine the best option for your organization.

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### Step 2. App activation  
#### Service  
Choose the Criteo service your API application will use: select C-Growth for Marketing Solutions or C-Max for Retail Media.

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### Step 3. Authorizations  
#### Domains  
Choose the domains to specify which permissions your application requires.

After this step, you can no longer change the name, description, image, or app scope.

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## App Credentials  
### Create new key  
To generate your `client_id` and `client_secret`, click the `Create new key` button. This will trigger a download of a text file containing your API keys. Make sure to store the keys securely for future access.

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## Consent URL  
### Generate new URL  
Once your API application is set up, you must request consent from the advertiser or publisher to access their assets. You can generate multiple URLs, but **each URL can only be used once**.

- Click on `Generate new URL`. This will generate a fresh new consent URL every time this step is done.
- Click the `Copy` icon to the right of the consent URL field.
- Share this URL with a user who has access to the CMax account. Users with **Admin**, **Business Manager** or **Technical Manager** roles can grant consent to API applications in Retail Media. For more details, check [User Management](https://help.retailmedia.criteo.com/kb/en/user-management-127278) in our Help Center.