Ringcentral exposes different type of APIs for different way of cloud based communication like sms,fax etc. There are different way you can integrate the APIs with your application based on which platform form or language your application is built. Any communication between an external program and RingCentral is performed through the ringcentral APIs.

There are different SDK available for different programming languages.

The SDKs package RingCentral APIs into easy-to-use libraries for each programming language.

You can find the JavaScript SDK with the JS Developer Guide here.

For Python programmers here is our Python SDK

Our official c# SDK is here : https://github.com/ringcentral/ringcentral-csharp

.Here is the sample code to send a Fax message using the Java SDK

Thanks Anirban