For proper security of resources, a token is required to access all API resource endpoints.
An API token generated using a developer key created on your portal will carry the permissions assigned to the key upon creation, and will only be able to access resources to which those permissions apply.
The API access token can be obtained using the endpoint for token found on the Get Access Token page.
To access each endpoint, the token will need to be added to the header of every request, using the key x-auth-token.