"Most pleasing it is to meet you, Mr. Potter. What brings you here today?" 

"It seems you're in a bit of a pickle. You'll never be able to enjoy any of the money you're making because it's illegal. What you need, is a legitimate front so that the wizarding government thinks you made the money honestly. Of course, I'd be willing to stick my neck out for you and step into this operation... for a price." 

"You kids are still in school. You don't know the first thing about laundering money. Me? I'm an expert.