The Content Villain API uses API keys to authenticate requests. You can view your API key in the settings page of the Content Villain web application. You must be on a plan that allows API access to view an API key.
Your API key is the literal key to the kingdom. Please do not share them, please keep it secure. Do not post it in publicly accessible areas like GitHub.
Authentication to the API is performed via a header which needs to be send with every single request.
All API requests must be made over HTTPS. Calls made over plain HTTP will fail. API requests without authentication will also fail.