Google Play Games Services Tutorial in Unity (Part-1) - LOGIN and ACHIEVEMENTS and LEADERBOARDS

Sign-in, Play Games Services

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Login loops on fresh install, if server auth code is requested · Issue #1816 · playgameservices/play-games-plugin-for-unity · GitHub

Android Developers Blog: Improvements to Sign-In with Google Play services 8.3

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How to Create Pigg Party Account and Link It to Google Play Games/Game Center. – Argento

MSDK WIKI