I'm always slightly bemused when I read this in field reports.
For me, 'sorting out the paperwork' is what happens when some bloke in overalls and a pencil behind his ear drops off some furniture or other kit at my house, and has a packing list and an invoice with him that needs checking, and then when that's happened, maybe I have to give him a gregory and then he checks it and then off he goes and we're all happy. Process can take anything from one minute to twenty.
But when I visit a tart, I've got the cash ready and I hand it to her and she might look at it and she might not and she stashes it, and that's that. There's no 'paperwork' and there's nothing to 'sort out'.
Or am I not doing this right? Maybe one of us should have a pencil tucked behind our ear?