The CloudGuard REST API uses HTTP Basic Authentication.
You will need a V2 API key and a secret in order to use the API.
You can generate the key and secret in the CloudGuard web application (https://secure.dome9.com), under the 'Settings > Credentials' section.
For detailed instructions see Create a CloudGuard API Key
Your permissions when using the REST API with the key will be the same as the permissions of the CloudGuard user who generated the key from the CloudGuard web application.
Example:
curl -u your-api-key-id:your-api-key-secret https://api.dome9.com/v2/CloudAccounts