Setup different APIs per stage

How do I setup my serverless.yml to deploy to different APIs depending on the stage?

Basically I want this…
https://xyz67890.execute-api.us-east-1.amazonaws.com/dev
https://efg45678.execute-api.us-east-1.amazonaws.com/staging
https://abc12345.execute-api.us-east-1.amazonaws.com/prod

Not this…
https://abc12345.execute-api.us-east-1.amazonaws.com/dev
https://abc12345.execute-api.us-east-1.amazonaws.com/staging
https://abc12345.execute-api.us-east-1.amazonaws.com/prod

The reason is when I deploy a new stage, the previous stage is replaced. For example, if the API DEV is currently deployed, when I deploy STAGING, DEV is replaced and I can’t access it anymore. Although, I can access STAGING now. I need to always have access to each stage. Perhaps I need a different solution?

I’m specifically looking at the “Separate APIs for each stage” section of the following guide: https://serverless-stack.com/chapters/stages-in-serverless-framework.html

maybe you can try to have 3 folders (1/stage) all syncing to [branches of] the same repo?
Mote hackily, maybe renaming the serverless folder in your service directory - isn’t that where serverless ‘remembers’ to which stack the service is deployed?