Setup iOS push notification on firebase

1. Login to Apple developer account at https://developer.apple.com/account/
2. Go to https://developer.apple.com/account/ios/authkey/create
3. Enter Name as “Push notification” and check APNS

4. Click Continue & then Confirm and Download generated key (.p8 file)

5. Go to https://console.firebase.google.com/ select your project 
6. Open project settings 

7. Select CLOUD MESSAGING from tab

8. Scroll to iOS app configuration and upload your downloaded .p8 file