You'll need to include an Authorisation bearer token in the header with every request you make to the Intruder API.
Authorisation tokens are personal access tokens, i.e. they are linked to your Intruder user account.
To generate a personal access token, head to the settings page in the Intruder portal and click on "API Access Tokens". Enter a name that describes what this token will be used for and (optionally) specify an expiry date after which the token will automatically be revoked.
Once you've created the access token, please ensure you save the token in a safe place (e.g. a password manager) as you won't be able to access it again.
If you need to revoke the access token at any time, just click the Revoke button.
For more information on how to use the Intruder API, please check out the Intruder Developer Hub.