Returns an XML payload containing person registration details for an activity. This payload includes the registration status (true/false) and the order ID for the registration (if available). Only a valid call if called within a HighMarksCE project.

Sample Request URL: [EndPointURL]/?do=cnt.getservice&service=getIsRegisteredForActivity

Parameter Options:
*apiKey: Valid API key 
*attendeeID: Numeric identifier for a valid attendee. Use this parameter to request the details of a single planner.
*plannerID: Numeric identifier for a valid planner. Use this parameter to request the details of a single planner.

Sample XML Payload:  See Rest_GetIsRegForActivity.xml