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I'd like to offer an auto-renewable subscription for app users, but give some users a promo code which will give the user a free trial but NOT auto-renew at the end of the trial. Is it possible for Apple to accept that promo code and handle this case? Or would I have to handle validating the promo code and offer a different "promo" subscription product?If I had to validate promo codes, would I still be able to let the user have free access via the App Store subscription for a period of time? This would basically be a free non-renewing subscription, but I can't create a free subscription, and it wouldn't be ideal to make them enter another promo code to get the discount.