some info on how the transactions work these days would be appreciated

old account dealer here, back when pking/staking/uncapped trades made the game actually good

given up on combat skill, and wanting to sell this account
(inserting picture in a few mins)

and continue a bit of skilling on another account.

So, if i successfully find a buyer, how does the gp transfer work?
surely things have changed from just acquiring a mm?

any info would be appreciated
cheers