The body of the callback. Can leave blank if no body is needed. For example, a JSON body would be entered like { "key1" : "value1", "key2" : "value2", "key3" : "value3", ... "key10" : "value10" } If you would like to receive the completed profile's ID back as part of the json body, set the value of one of your keys to $$$profileId$$$ like {"profileId" : $$$profileId$$$}