Calendly API Dev version

[kedar-sugarcrm]

Wondering if Calendly has a DEV version of the API that we can test/call during our development.

We are using the Webhooks to post meeting information to an external application
We have a DEV UAT AND PROD version of our application.

However, when we create/register a separate webhook with a callback URL pointing to our 3 ENVs, the webhook push happens to all 3 environments.
If we just register 1 hook for PROD, we are unable to test on our DEV/TEST environments. We are having to delete our DEV/UAT webhooks so that PROD meetings dont get pushed to our DEV/UAT envs.
Then when we need to "debug" / develop new features, we have to create the webhooks pointing to our DEV/UAT envs again.

Is there a DEV API that we can explicitly test against instead of the "PROD" / "LIVE" API ie https://api.calendly.com/