Looking for Mobile Developer for Push Notification

Job ID: 31416916

Budget: $8 – $12 USD

I have both ios and android app that were converted from PWA website into mobile app using wrapper
Now, I have to implement push notification into existing mobile apps.
Previous developer configured firebase push notification, but it has not done yet.
The remained issues
- IOS issue
* push notification doesn't send to iphone5s, 6 plus, etc (ios version 12.x) and iphone 12 (ios version 14.x)
it seems it sends only ios version 13.x
- Both iOS and Android
* we have to send push notification according to firebase database change (i.e. firebase database has order status, and we have to send push notification to customer when order status is changed)