When attempting to subscribe to the GoodWhale App through Apple In-App Purchase, we're sorry to inform you that it's not possible to apply any promo code. As a workaround, we encourage you to subscribe to GoodWhale via a web browser, such as by visiting http://app.goodwhale.com/. This alternative method allows you to apply a promo code at the checkout stage, ensuring you can take full advantage of any promotional offers you have.