I'm not 100% sure on the rules, but it would be overseen by the AIBA. Most likely it would be done under APB rules, which are sort of a halfway point between amateur rules and professional rules. THe APB rules come from the AIBA, they introduced them a few years back to stage special tournaments for prize money for boxers still in the amateur code. It was designed to stop top amateurs from turning pro.
"Let your food be your medicine, and your medicine be your food" Hippocrates.