I have two google accounts, first is for Notifications and second is for Google sign in. For implementing this two services I should add two configuration files in my android application, but i can't do that because google does not support that. I had searched in google, there are people who recommend to use flavors, but I can't do that. So I think about merging two google-services.json files. Or should I remove
one of google accounts and create new one in second account. What should I do?
Its better to use single google account. You can use both Google sign in and Notifications api in single account.