because my apps package name and SHA-1 already register to Oauth 2.0 in google credential.
is it possible use GoogleSignIn without firebase (googleServicesFile)?
just using clientID without firebase.
i add googleSignIn in app.json but not works:
"config": {
"googleSignIn": {
"apiKey": "MY KEY",
"certificateHash": "MY CERTIFICATE"
}
},
same error
GoogleSingIn.null: DEVELOPER_ERROR