Null values in the Sinch APIs can be omitted in requests and will be omitted in responses. In some cases, explicitly setting null will overwrite a previously set value with null. See Update a group for an example.
New features might result in additional request and response parameters. New request parameters will either have a default value or be considered optional to retain backwards compatibility. It's highly recommended to ignore any unexpected parameters when reading JSON in API responses and in callback handlers.
