The player is logged into the game. He wants to link a Google login to his account. It's linked to another account already, so he gets a popup with some info.
Now I want to tell him the level of his current account vs the level of his Google account, so he can make an informed decision.
How do I get data from an account if I only know one login identifier? Public data would be fine. The only way I see is to log into each account, but that's not really practical.
Getting player data without PlayFab ID is not supported. Currently related PlayFab APIs are based on PlayFab ID, otherwise, you need to login into that player account.
First of all, getting a valid Google access token means the user has passed Google’s verification process, which means in most of the cases, it is safe and we can assume the user owns this account. Second, as you have said “The player is logged into the game”, a PlayFab account should be created already. When logged in and LinkGoogleAccount is called, there will be 3 conditions in your scenario:
1. (link fails) User selects local data to overwrite the Google-linked account.
2. (link fails) User selects Google-linked account to overwrite the local data.
3. (Link succeeds)
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