Environments are groups of WunderNodes, deployed to one or more regions, accessible through a domain name.
Each namespace will always contain a primary environment and can have as many secondary environments as you need.
Assuming your namespace is named "example", the primary environment will be accessible through the following domain name:
If, for example, you're adding a secondary environment named "staging", it would be accessible through the following domain name:
Once you have your Environments in place, you're able to deploy APIs to them.