Push Notifications for production

I’m trying to develop a fully char app, kind of private whatsapp with some extra features for our needs, so i need push notification engine for that so i have some questions about expo push notification:
1.Is expo push notification is good enough for production?
2.I know there is no define capacity but there is a estimated bandwidth/capacity for messaging?
3. There is a way to make it better for push notification and still use expo push notification? like pay extra money for prod usages?

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