To use a predefined credential type:

1. Open your HTTP Request node, or add a new one to your workflow.
2. In **Authentication**, select **Predefined Credential Type**.
3. In **Credential Type**, select the API you want to use. 
4. In **Credential for `<API name>`**, you can:
    1. Select an existing credential for that platform, if available.
    2. Select **Create New** to create a new credential.