private void PlayFabAuthService_OnLoginSuccess(PlayFab.ClientModels.LoginResult success)
    {
        Debug.Log("Playfab Success");


        var request = new ExecuteFunctionRequest
        {
            FunctionName = "HelloWorld",
            //FunctionParameter = new PlayFabIdRequest
            //{
            //    PlayFabId = success.PlayFabId,
            //},
            AuthenticationContext = new PlayFabAuthenticationContext
            {
                EntityToken = success.EntityToken.EntityToken
            }
        };

        PlayFabCloudScriptAPI.ExecuteFunction(request,
            (result) =>
            {
                Debug.Log("success");
            },
            (error) =>
            {
                Debug.Log("fail");

            });
    }