Since I am going through this right now, I might as well suggest how to prevent people from getting chargeback because of someone else. First of all, I think there should be a confirmation whenever you buy an item. For example, during gameplay, when the message pops up saying you bought an item, you can either say Yes to agree with it or No to disagree with it. Saying Yes will give you the item, and saying No won't give you the item. If someone accidentally says no, you can screenshot the message as well as the proof of purchase from your confirmation email. If people say Yes even though they didn't buy it, then they are prone to a chargeback ban. This might happen more than the accidental no just because players are greedy. I hope this feature can be implemented to prevent wrongful blacklisting.