ServiceBroker REST APIs allow other systems to be integrated with ServiceBroker.    

See the REST Integration Overview for more details on best practices when integrating with the ServiceBroker REST APIs.  

In addition to the REST APIs, ServiceBroker also provides a number of RESTified APIs. These additional APIs provide "pass-through" integration support with sub-systems that are supported by ServiceBroker, but where native ServiceBroker support for the sub-systems actions are not yet supported.

Please see the details on the RESTified APIs page for more detail about the use of these additional "pass-through" APIs.