All of these methods require authentication and authorization .
To retrieve a saved game from a REST API call :
https://www.googleapis.com/games/v1/snapshots/{ID of save}
To get a list of saved games :
https://www.googleapis.com/games/v1/players/{me | ID of player}/snapshots
Saving the game is more messy, since you have to use the API drives to create the file:
https://www.googleapis.com/upload/drive/v2/files
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