> For the complete documentation index, see [llms.txt](https://developer.securecontainerrelease.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.securecontainerrelease.com/getting-started/testing-and-sandbox/sandbox-environment..md).
# SANDBOX environment.
To test the basic operations of the API, you can use the following API endpoint in our UAT environment:
#### Test endpoint UAT
```
https://test-admin.securecontainerrelease.com:4430/legacy/tmining/api/v1
```
{% hint style="info" %}
Please note:
* These endpoints do not use authentication, so you can use them without tokens, but in a production environment you should enable authentication
* This also means this data is visible to other companies that are testing in the UAT environment, so please do not add sensitive data
{% endhint %}
You can retrieve a list of releases using the GET [/releases-endpoint ](/api-reference/releases.md)and start from there
#### Postman collection
To allow you to test the whole flow we also have a Postman collection that contains endpoints to do all operations on test releases. This can be obtained from support by emailing The Postman collection contains a large list of endpoints
{% hint style="info" %}
**It is however important that you follow a basic flow:**
1. A release is created by the carrier
2. By using the “Carrier - Transfer a release” endpoint, you transfer the release to the test
organization
3. Afterwards the test organization can do a number of transactions using the endpoint
without “Carrier” in the description
{% endhint %}
