User accounts
Users can freely create accounts. Each user account stores balance, in-game nickname and flags. Flags usually describes user's permissions.
Each user starts up with 0 funks on balance and money_recv, money_send flags, whic means they can send and receive money from others. Ofc, funks can be freely transfered between accounts.

Admin console
Using an administrative account you can edit, add or remove store items, manage user accounts and more. Administrator account is able to edit money value, so it can produce infinite amounts of funks.

3D printng
You can give users an ability to print things directly in the server's world by adding print flag. Printing feature is not designed for large things and may crash your MC server.

Marketplaces
There is a places in the world where users can place blocks on and sell them for funks by clicking the market's link. Unfortunately, market editor is not (yet) implemented in admin interface, and you have to manually insert market records into markets collection. Consider the following example: http://pastebin.com/g15AhqHe

Storage directory is used to share custom content, like pics and stylesheets, so they will be available at address like "yourhost/storage/file.png".