Manage Consumable IAP promo code

问题

I would like to know how to manage an In-App Purchase bought using a promo code.

In particular in my app I have a consumable that enables a feature, so I was wondering how to get the event that someone has bought that iap using a promo code, so that a can enable the feature.

Thanks

来源：https://stackoverflow.com/questions/41639555/manage-consumable-iap-promo-code