The access token is generated from API credentials (Client ID and Secret) created through Incognia dashboard. To generate an API credentials pair:
Go to API credentials page
Click on Create API credentials
Download the credentials and save the entry
Notice Client ID and Secret aren't the access keys themselves. You need to hit the access token endpoint in order to generate a short-lived access token.
To revoke the access to a specific API credential, simply go to the API credentials page and delete the entry you want to revoke.