Authentication
api_key, or by using your access token as a Bearer token. You can request an API key by logging in to your account on TMDB and clicking here.
Bearer Token
The default method to authenticate is with your access token. If you head into your account page, under the API settings section, you will see a new token listed called API Read Access Token. This token is expected to be sent along as an Authorization header. A simple cURL example using this method looks like the following:
session_id query parameter. You can generate a session_id by following the steps outlined here.