I'm updating an android App, here previous developer used firebase for push notification and I have access the account. When I'm updating the app with new computer is it mandatory to add sha1 key of my computer in firebase account or google json file, because I cant add multple keys. help me please.your help will be apreciated
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you can delete the sha1 key and create new one and upload that in firebase @Irshad – Brahma Datta May 06 '19 at 11:05
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You can add another sha-1 key like this:
Go to firebase console and follow these steps:
In your project click setting->project setting
In "your app tab" click add fingerprint and add your sha-1
And you can add multiple keys to your project like this.

Tamir Abutbul
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an auth2 client already exist for this package name and ShA 1 in another project – Irshad Madappat May 06 '19 at 10:21
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check [this](https://stackoverflow.com/questions/24160011/the-signing-fingerprint-you-specified-is-already-used-by-another-android-oauth2) – Tamir Abutbul May 06 '19 at 10:32