initialize

This method initializes the Play Games SDK. It should be called right after checking that the plugin is loaded into Godot, for example:

func _ready() -> void:
	if Engine.has_singleton(_plugin_name):
		print("Plugin found!")
		var android_plugin := Engine.get_singleton(_plugin_name)
		android_plugin.initialize()
	else:
		printerr("No plugin found!")

If the user has automatic sign-in enabled, the initialization will check for authentication.