Basic Authentication: Simple (Nov 2017)
The Simple authentication policy protects the API by requiring username and password when calling apps make a request. You can follow the general instructions for applying a policy, and enter the user name and password to configure the credentials.
You can also configure resource-level policies and methods.
After applying this policy to the API, a request to that API must contain the following header:
Authorization: Basic <username:password>
where username:password is a base64-encoded string. In Mac OS X or Linux, for example:
echo '<Client Id>:<Client Secret>' | base64