question

    public void UseCoupon()
    {
        string couponCode = ActivatePromo.text;
        Debug.Log("Got couponCode: " + ActivatePromo.text);
        var primaryCatalogName = "DailyFree";
        var request = new RedeemCouponRequest
        {
            CatalogVersion = primaryCatalogName,
            CouponCode = couponCode // This comes from player input
        };
        PlayFabClientAPI.RedeemCoupon(request, CouponSuccess, LogFailure);
    }
    void CouponSuccess(RedeemCouponResult result)
    {
       Debug.Log("coupon was successful. granted item(s): " + result.GrantedItems);
    }


    private void LogFailure(PlayFabError error)
    {
        Debug.Log(error.GenerateErrorReport());
    }

code:

@Brendan