Recommended Sync settings for multiple environments

We recently discovered that a client’s MailChimp account was not only syncing to Production, but to the Staging and Development Environments as well.

Avoid data sync issues

Keep your staging website synchronized with your live site. Otherwise, you can suffer data loss when you try to make changes. You can use a plugin to keep the synchronization with your WordPress staging site, but you can also do it manually.

https://mailchimp.com/resources/staging-site/

I could not find any related documentation, for what is essentially a pretty common setup.

I also looked into some of the available Constants in the codebase and saw none related to managing this aspect of deployment.

It would very useful to be able to set some environment variables, so as keep production and dev/test data separate.

Please advise

Regards