This API will return a list of attendees who have not completed the registration process.
API accepts authorization and recurring event id for recurring events only.
Once executed this API will return a CSV file containing the attendee's first name, last name, and email id.
Here are the possible error messages, which return if any condition gets failed or required data is missing for processing.
|Error Code||Error Description|
|400||The request could not be understood by the server due to malformed syntax.|
|401||You are not authorized to view the resource.|
|403||Accessing the resource you were trying to reach is forbidden.|
|404||The resource you were trying to reach is not found.|
|4030201||Not Event Host.|