Refund of iOS in-app purchase - triggered by developer, not end user

Question

Case:

Our iOS app offers selling of custom made recipe packages that would be created for each user specifically. For example - user buys package of rec

Answer 1

If such scenario isn't possible via Apple refund, are there some examples of this kind of purchase model, implemented in some other way?

In some cases you can use payment through PayPal (for example). We did it in our application where we had to take money of users and return it after a certain period. Check if you case is suitable for using third-party payment systems. Because (for example) Apple will restrict your app if you want to sell in-game content via Paypal, not with in-app purchase.