StoreKit2 IOS17 RedeemCode recognition of purchase

I have implemented auto renewable subscriptions in my app, as well as promo codes. Purchase of subscriptions both monthly and annual; work correctly. What I don't know is what to "listen for" instead of product, when the user uses a promo code to purchase the product. am I looking for a different product code? or product identifier when the offer code is used to subscribe?

StoreKit2 IOS17 RedeemCode recognition of purchase
 
 
Q