When you say "nostr marketplace" do you mean "Nostr Market" or the app with an identical icon named "Marketplace"?
Discussion
Nostr market not the marketplace.
Investigating it now...
Not going well so far.
I can add a (shipping) zone, but then I can't select that zone when trying to make a "new stall". The only option for shioping zone is "Online (Free (digital))".
I am also having trouble finding a way to have money go to a non-custodial wallet.
I can't find any help or documentation on how to work around these problems.