I'm making a game right now that is similar to a moba. I have 4 "roles" set up. I'd like to set up some kind of shop where players can buy grenades or upgrade to req weapons of their weapon. Ive seen something like this done in the night of mantis map. But have no idea how to pull it off.
Scripting. Lots of scripting. Honestly, I'd pop in the discord and talk to someone in the scripters guild. It's not really something you can just explain so you might need to have a proper conversation on discord or get someone to join you in game to help. In simple terms, I presume your game is giving players points for stuff. You can use buttons or something that when activated decrease the players score with the benefit of it spawning a weapon. Hardest part is making it so you can only buy something if you have enough money. I could possibly work out how to do that but I don't know off the top of my head. Go look at the scripting in Night of the Mantis. That may help.