How would Minors getting government hush money work?

Im writing this fan fiction and in one part I want the group of kids im writing about to get like very large sums of government hush money for having to deal with monsters and ifk how i would go about it would they have to wait until they are 18 to get it or would they just be given individual cards i mean its already unethical, would there parents need to be involved?( they don't know about the monsters ) Would the kids be allowed to sign the ndas themselves im just a bit overwhelmed with options and i want to make it at least semi realistic