RingCentral allows programmatic third-party access to two of the most popular features RingCentral offers: RingOut and FaxOut. The RingOut API allows programmers to build applications and UIs that utilize RingCentral RingOut technology for making calls. The FaxOut API enables you to put all the power of RingCentral fax services under the hood of your applications.
To access RingCentral API documentation, please use the links below:
RingOut API - http://service.ringcentral.com/ringoutapi/
FaxOut API - http://service.ringcentral.com/faxoutapi/