Transactional Push Notification ideas?

Hi - We hope to launch some basic transactional push notifications which we were told were high performers! I was wondering if anyone has done something similar and if they had any ideas of some of the 'lower hanging fruit' of transactional push's that were high performing...

Some examples that we are starting with are:
1. Order Confirmed
2. Order Shipped
3. Order Delivered

Are there any other 'transactional' messages such as the above that you have seen success with?