Display name as identifier

[kaushalkumar86]

I am using this package to sign the user on unity and then passing the auth token to firebase for user login.

1. I am requesting email in requestServerSideAccess but getting no email id.
2. Upon authentication in firebase, the user is created with an identifier which is the display name of playgames user and not playgamesid. Due to which if the player signs out and changed its display name and logins again in my app, firebase sees him as new user and creating a new account.

I would like to request that while generating token-id for auth, add playgamesid in identifer (UID) and not the display name.