One of the most common things you want to do when opening up your API is set access policies for users to ensure everybody gets fair use and system resources aren’t threatened with overuse. Often it also makes sense to apply different policies to different groups of users – basic access for some, more liberal policies for others.
This post now has it’s own set of how-to’s on the 3scale support portal. Check them out here:
Also check out the Hello World API Quickstart Guide.