# Authorization

Obtain client access tokens for API authorization when needed (see [Authentication](/openapi/api_ref_intro/#authentication)). Click **Try it** from the API explorer below to generate access tokens directly from the docs. You can then use these tokens to run API requests in this API reference.


## Servers

Sandbox environment
```
https://api.sbx.transmitsecurity.io
```

Production environment (US)
```
https://api.transmitsecurity.io
```

Production environment (EU)
```
https://api.eu.transmitsecurity.io
```

Production environment (CA)
```
https://api.ca.transmitsecurity.io
```

Production environment (AU)
```
https://api.au.transmitsecurity.io
```

## Download OpenAPI description

[Authorization](https://developer.transmitsecurity.com/_bundle/openapi/token.openapi.yaml)

## Other

### Get client access token

 - [POST /oidc/token](https://developer.transmitsecurity.com/openapi/token.openapi/other/getaccesstoken.md): Retrieve an access token to authorize your API request. By default, the access token is valid for 1 hour, you don't need to regenerate it every time before calling Mosaic APIs.  NOTE: The request type and examples depend on the service you choose