Currently the Push Notifications are not data objects that have permissions just like any regular content type and can be filtered based on user's role. That is why there is no article specified in the documentation on how to get a list of your notifications.
However there is an endpoint for getting your push notifications that require MasterKey authorization:
but having your Master Key
as part of your mobile application that is delivered to your users is strongly against our recommendations
. If someone get access to your Master Key, he can erase your data or break you app structure of your Backend Services project.
If you explain in more detail, what are you trying to achieve, we may try to find another solution to your problem.