I'd like to contact the people who purchased the subscription of my app. How can I do it? Thank you!

Hi, Can anyone help me find any Apple documentation for me to write in the codes to find out who subscribed for our app so we can send promotion activities to them. Thanks a lot!

Hi, Apple gives 100 promo codes for subscriptions and each promo code is unique and can be claimed only once (?). So if we want to do a mass giveaway, that means we have to send each promo code individually to each user. Is that correct? If so, is there an easier way (e.g. a "master" promo code like those Bed, Bath, and Beyond coupons)?