If this ever happens, please post a thread here in the forum and we can manually confirm the payment for you and mark the order as paid.

Well, since it happens often, maybe you could even warn users first, by inserting a message in the payment form or anything else that warns users of the possible problem. How does a person know before it happens?

In any case, I don't have any double payment IDs, of course. (I just found out that an item paid twice may not necessarily have two different IDs.) I only have one, but I took a screenshot where the item is purchased but still awaiting payment. How is it possible? This is the first time something like this has happened to me in all digital stores, including others that sell 3D stuff.