You can now define stage variables to configure the different deployment stages (e.g.,alpha, beta, and production) of your API. Stage variables are name-value pairs associated with a specific API deployment stage and act like environment variables for employ in your API setup and mapping templates. For example,you can configure an API method in each stage to associate to a different backend endpoint by setting different endpoint values in your stage variables. Learn more about stage variables in our documentation.
Source: amazon.com