json_schema: {
      "description": "Shampoo push message specification",
      "properties": {
          "push_data": {
              "description": "Response data from the called method",
              "type": "object"
          },
          "push_event": {
              "description": "Name of the push event",
              "type": "string"
          },
          "type": {
              "pattern": "push",
              "type": "string"
          }
      },
      "required": [
          "type",
          "push_event",
          "push_data"
      ],
      "type": "object"
  }