In addition to the environment variables provided by Cloud Platform, you can also create custom environment variables using the Cloud Platform user interface. These custom environment variables are set globally on a per-environment basis and can be used to define anything your application may need to work with, including Drupal APIs and environments.

To add a custom environment variable:

1. Sign in to the Cloud Platform user interface.
2. Go to Codebases and select a specific codebase.

3. Click Environment and select an environment for which you want to create an environment variable.

   
4. Click Variables.
5. Add the variable by following the steps in Creating custom environment variables.