The information is in the readme file, but here's a brief summary (from the readme file)
[spoiler]The Wallet mod is a simple mod that allows you to keep track of
and give/dispense your credits. This can be useful in many ways,
such as for fun maps, like the dxalpha funline maps, or rpg maps,
like Cozmo RPG. It also comes with money classes that you can
place in your maps. (Use M1, M5, etc., not M1T, M5T, etc. as
those do not respawn)
[/spoiler]
What's new?
[spoiler] > Improved functionality (You can directly give money to players
or directly deposit and withdraw from a BankingATM Actor)
> Banking Mutator (Stores info serverside, saving it for future use -
also removes potential money glitching)
> Green, dark blue, cyan (light blue), and red wallet variations
> Improved money textures
[/spoiler]