GetMoneyCallback.cs

public static void GetMoney(Action<string> onMoneyPulled, Action onFail)
{
    PlayFabClientAPI.GetUserData(
        new GetUserDataRequest(),
        result => {
            if (result.Data == null || !result.Data.ContainsKey("Money"))
            {
                Debug.Log("No value for money");
                onFail();
            }
            else 
            {
                amount = result.Data["Money"].Value;
                Debug.Log(amount);
                onMoneyPulled(amount);
            }
        }, 
        (error) => {
            Debug.Log(error.GenerateErrorReport());
            onFail();
        });
}

void Start() {
    GetMoney(
        money=> {
            moneyText.text = money;
        }, 
        () => {
            moneyText.text = "Failed to pull money";
        }
    )
}