Previous Attributes on Webhooks
Directory user and group webhook update events now include a previous_attributes property that show changes since the last snapshot of the user or group. The value in `previous_attributes` is an object that contains names and values of attributes that have changed.
We are sending along shallow changes in root properties, raw attributes, and custom attributes. If a new attribute is added in the current snapshot that did not exist previously, then the previous_attributes object will contain the attribute name with a`null` value.