code: public static PushNotificationPayload fromJSON(String rawJSON) throws JSONException {
  		PushNotificationPayload payload = new PushNotificationPayload(rawJSON);
  		return payload;
  	}
docs: Create a PushNotificationPayload object from a preformatted JSON payload.
  @param rawJSON a JSON-formatted string representing a payload (ex: {"aps":{"alert":"Hello World!"}} )
  @return a ready-to-send payload
  @throws JSONException if any exception occurs parsing the JSON string