Everything you need to know about the addon is in the video below:

One way of earning money is the depositor. You can sell items that you find in it. Here are all of the things you can sell in it as well as how much money you get from selling them (price on top and item/amount on bottom):

Items can be bought with money from merchants that spawn around the world

Gilded zombies spawn rarely and drop coins when killed

All new items/blocks:

Gildum ore can be found below y=-10 and can be turned into coins in a coin forge (or smelted for fewer coins)

Player shops allow players to buy and sell items with each other (a full explanation of how to set them, up is in the video at the top of the page)

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Stand next to a shop spawn block (above) and interact while holding a wrench to rotate (Do NOT interact with the block, interact while standing next to it)

You can put money in and take money out of your bank with an ATM, this money gains interest over time

There is an item called a package, you can put items in it and take them out for selling more than one item at a time. Right now it is still in a beta form as it has some multiplayer bugs and may not always work. I could see this being overpowered, so world owners can type "function nopackage" into a repeating command block to disable them.