---
url: /topics/environments.md
---
# Environments

## Use of the values

| Value              | Use                                                                                                                       |
| ------------------ | ------------------------------------------------------------------------------------------------------------------------- |
| broker-front URL   | The address where Broker-side Users sign in. See [Sign in to Quarzo](/guides/sign-in-to-quarzo).                          |
| API base URL       | The start of each Quarzo API request URL.                                                                                 |
| ZITADEL issuer URL | The `authority` of the token request, and the `aud` claim of a JWT assertion. Use it with no trailing slash.              |
| Quarzo project ID  | The audience scope `urn:zitadel:iam:org:project:id:{quarzoProjectId}:aud` of the token request. This value is not secret. |

[Call Quarzo from a Broker backend](/guides/call-quarzo-from-a-broker-backend) shows these values in a token request.

## Sandbox data

The sandbox is for tests. Use only test data in the sandbox. Do not enter personal data of real Subscribers.