Check if a username is available for use or not. Valid for Communifire version 5.2 and above.
True/false is returned as ResponseMessage.
Please Note The content type that you pass in the header of your request should be application/json.
is requesting access to a wiki that you have locked: https://my.axerosolutions.com/spaces/5/communifire-documentation/wiki/view/5717/rest-api-check-username-availability