Every new community starts with one currency, Gold. GMs hand it out after each session and it adds up on the character. Until an admin makes a marketplace, though, players have nowhere to spend it.
If that's all your game needs, you're done. The rest of this page is for when players want somewhere to spend it, or you want to count something that isn't money.
Probably not. In a West Marches game the money mostly sits in town between trips, and nobody counts coppers on the road. So don't track copper, silver and gold as three currencies that convert into each other. Use one. Amounts go to two decimals, so a torch can cost 0.01 Gold.
A second currency is for something that isn't money, and that each character earns or spends on their own.
Running Daggerheart, with its handfuls and bags? The Daggerheart guide makes the case for counting coins anyway.
Currencies live in Settings → Currencies. If players shouldn't hand one to each other, like Renown, edit it once it exists. That switch is only in the edit dialog.
Above the list are two Currency Transfer Settings, both on in a new community. Leave the one for other players' characters on, because splitting loot is part of playing together. Switch off the one between a player's own characters if a new character shouldn't start with the last one's savings.
Deleting a currency takes it off every character, and there's no undo. If all you want is a new name, edit it instead.
GM rewards, transfers and marketplace purchases each add a line to the character's Rewards tab. Each has a Discord notification too, and nothing is posted until you pick a channel in Settings → Discord Channels. Getting Started puts all three in one #rewards channel.
Gave out the wrong amount, or bought the wrong thing? An admin can undo it with Revert Reward, in that line's menu on the Rewards tab, and the balance goes back.
In Settings → Marketplaces, Use an existing template starts you from one of 11 price lists for D&D 5e, D&D 3.5e, Daggerheart and Dragonbane. It's only offered when you create the marketplace. After that, Edit Items opens a spreadsheet, and you can paste rows in from Google Sheets or Excel if the columns are in the same order.
A cost can mix currencies and XP, and the character pays all of it. Level Req keeps lower-level characters out. Tick Notes Required when the GM needs an answer, like which spell goes on a scroll. The player can't buy without writing one, and the note shows on the Rewards tab and in the Discord post.
A purchase doesn't touch the character sheet, so players add the item to theirs themselves. (Heroic communities can also switch on inventory in Settings → Marketplaces, and then a marketplace can put purchases straight into it.)
A negative cost is what the character gets, and the marketplace shows it in a Gain column. It works for Experience too, which makes it the handiest trick on this page.
Carousing is the obvious one. Put 50 in Gold and -100 in Experience, and a night in town costs gold and pays out XP. It's how the Shadowdark RPG guide handles carousing.
Careful with the other way round. A positive Experience cost takes XP away, and the level follows, so buying the item can take a character down a level. Say so in the description.
A reset task, under Currency Reset Tasks in Settings → Currencies, sets one currency to a Target Value for every approved character, daily, weekly or monthly. It doesn't add to the balance, so points nobody spent don't pile up. Reset Downtime to 7 every Monday and each character gets a week to spend. Use it or lose it.
A reset doesn't show on the Rewards tab or post to Discord.