The MindLink API is more of a package-product, meaning it comes with functionality that your bots decide to use or not use depending on the requirements. Functionality here is not so "For my deployment I want X or Y" and is instead "This bot needs to do X." at which point you utilise X. Unlike the other products you don't need to enable X first, you just need to configure the management center and start working with your integrations.
The Management Center section later covers the process of setting up and configuring the API.