Hi, this may just be a case of me looking in the wrong places, but how do you allow users to self-refund a game? I have not been able to find any reference to that in the developer portal or documentation.
For future reference:
It seems to be the default setting anyway. My confusion emerged from some games in the “Coming Soon” section showing that attribute in the store, and some not showing it. However, my game started showing it after it was released. I was probably just looking at games with / without the option to pre-purchase, without noticing that the attribute is (seemingly) only shown, for upcoming games, when that option is available.