When an Input is configured using the 'Receive JSON on a REST endpoint' connector the following new REST endpoint is exposed to allow devices, applications, and/or systems to send GeoEvents into the Input via REST:
To learn more about working with the REST Admin API please download the 'Tutorial - REST Admin API for GeoEvent Processor (ArcGIS 10.2)' that is available on ArcGIS GeoEvent Processor gallery on ArcGIS.com: