On Mirror API side: The notification about a timeline item has been performed some action on is sent in one of those two cases:
- this is a card created by the same application and user perform any the action on it (i.e. reply)
- this is a card from another app but user share it to contact that represent your glassware
The notification contain the timeline item id and action was taken by user
If this is time line item published by your Mirror API application - you can update it using update action
If this is a card created by your GDK app - you can update it using TimelineMnager.update(long id, Card card)