How to generate APN certificate so that it should handle to support both old as well as new application after ios app transfer

Question

I have transferd my ios app from my account(AA) to client account(BB).for push notification in fire-base server we uploaded APN (private key) which is generated by AA. But now account is changed and also i am updating app with new account. So if i upload new APN generate from new account, older app will not support push notification. But however i read like " we can generate a APN which will support older and new app"

But how to achieve that..?

With old APN i tried to push notifn to new app which is signed/updated with new account i.e BB , notification is failing..

Answer 1

1. If you are creating a new APNS certificate in (BB) account and you have to make your application live, in that case, you have to update application and firebase certificate with latest APNS.

2. Your existing application will have no impact, if you are creating new APNS certificate or not, it will work without any fail - until you update the APNS to Firebase server

   Note: If you change Push notification certificate in backend server / Firebase server, your existing live application won't receive any push notification.