Implementation of Push Notifications with PubNub

Hi Team
Is there anyone who has implemented PubNub push notifications? I’m trying to integrate push notifications for React Native android. The notification is received in background, foreground but in killed state I can not see it coming. It works if I send it from any online tools. So the issue is not with FCM, it’s something with PubNub. Moreover, I followed a debug guide and contacted Support as well but haven’t able to diagnose it. If someone has done it before, I’m looking for advice.