anchor.diff:  ### Notification templates
   
   Based on the "template" field defined as part of the subscription and in a macro replacement language
  -that could be used in "template" "callback", "headers" and "query". Details TBD.
  +that could be used in "payload", "url", "headers", "method" and "qs". Details TBD.
   
   ## Group API Entry Point
   
  
positive.code:                     }
                  },
                  "notification": {
                      "callback": "http://localhost:1234",
                      "headers": {
                        "X-MyHeader": "foo"
                      },
                      "query": {
                        "authToken": "bar"
                      },
                      "attrsFormat": "keyValues",
                      "attributes": ["temperature", "humidity"],
                      "throttling": 5,
                      "count": 12,
                      "lastNotification": "2015-10-05T16:00:00.00Z"
                  },
                  "expires": "2016-04-05T14:00:00.00Z",
                  "status": "active"
              }
          ]
  
  
negative.code:                     }
                  ],
                  "condition": {
                      "attrs": [ "temperature" ],
                      "expression": {
                         "q": "temperature>40"
                      }
                   }
              },
              "notification": {
                  "http": {
                    "url": "http://localhost:1234"
                  },
                  "attrs": ["temperature", "humidity"]
              },            
              "expires": "2016-04-05T14:00:00.00Z",
              "throttling": 5
          }
  
  + Response 201
  