How do I implement Push Notification in Android?

For security reasons, Parse Server is only supporting push notifications using master key and therefore push notifications can’t be sent directly from client anymore. You can see more details here:

The best practice now is to create a cloud function to send the push notifications. So your cliente will call the cloud function that then will send the push notifications.
In order to help our customers, we developed a code example of how you can create a cloud function to send the push notifications:
To call cloud functions from client, you can use the reference below: