Before giving some banned members another chance and unbanning, I want to force them to give a donation to a charity before being allowed back, for example to Oxfam.
But how could I, as a 3rd party, confirm that they really made a donation to the charity? Is it not possible?
EDIT: To clarify, the donation is direct to Oxfam, no money comes to me at all, that's why I need way to verify it actually happened.