---
schema_version: "1"
id: 2a64a8e9793271dda47cec81935d6e9ed9b1a4aae6b4c9dd176548bb3cd5590e
title: Call the API
collection: developer
version: current
locale: en-us
portal_url: https://docs.salesforce.com/developer/current/en-us/industries-integrations/comms/guides/call_the_api.md
canonical_url: https://developer.salesforce.com/docs/industries/communications/guide/call_the_api.html
source_site: developer.salesforce.com
content_type: documentation
content_hash: 7ea47ea64b19355f7e97b708fec73d7f182b73e949ce11080528d582d9b6985f
products:
  - Communications Cloud TM Forum API
  - Industries Integrations
---
# Call the API

Communications Cloud TM Forum APIs use the following URL format:

```
<Domain name>/<TMF API>/<API version>/<Resource type>
```

where

- **Domain name**:
  - **For US region in the Production environment** - api.commscloud.salesforce.com
  - **For US region in the Sandbox environment** - api.commscloud.salesforce.com/sandBox/
  - **For EU region in the Production environment** - eu.api.commscloud.salesforce.com
  - **For EU region in the Sandbox environment** - eu.api.commscloud.salesforce.com/sandBox/
- **TMF API** - Code of the TMF API
- **API version** - TMF API version
- **Resource type** - TMF resource type

The URL format in this topic applies to Mule Gateway access. For Direct Access (Connect/Apex REST) sample URLs and payloads, see the [Use Cases](https://developer.salesforce.com/docs/industries/communications/guide/TMFAPI_Usecases.md) for the TMF API you are calling.

To improve performance of OmniStudio-based APIs, [disable unused optional fields](https://developer.salesforce.com/docs/industries/communications/guide/disabling_fields.md) in the DataRaptor.