Inkarnate Currency for Marketplace (Inkbucks)

I would like an inkarnate currency (lets call it Inkbucks) for my transactions over the marketplace that is being worked on.

• Users must be able to buy certain amounts of Inkbucks for real money from inkarnate.

• Users must be able to use Inkbucks to buy "paid" composites from the marketplace.

• Users must be able to convert Inkbucks back to real money.

• Users must be able to set a threshold such that after that amount, their inkbucks is converted to real money an is sent back to their bank account.

additional info:

considering inkarnate wants to profit from the marketplace, the rate of inkbucks to real money could differ from rate of real money to inkbucks; or inkarnate could take a % royalty from every purchace.

Examples, considering 1 dollar is equal to 100 inkbucks

scenario 1:

I am a composite maker, and I primarily make sets to make real money as a part time job, so i have set my inkbucks threshold to 1000:

I make a set, and price it at 100 inkbucks (or 1 dollar). 11 people buy it, but inkarnate takes a 10% royalty, so i have 1000 inkbucks in my account. because i have reached 1000 inkbucks, I automatically get paid by inkarnate for a total of 10 dollars.

scenario 2:

I am a mapmaker/composite maker for fun, so I havent set my inkbucks threshold:

I see a set that I like, but it is 100 Inkbucks. I dont want to use my real money to buy Inkbucks so I make a composite set of my own and price it at 10 Inkbucks (because im not a pro). 11 people buy it, considering 10% inkarnate royalty, I have 100 inkbucks, this lets me buy the set I like. (Notice I neither paid nor got paid anything in real money, yet inkarnate made 10 cents from my sales, and 10 cents from my purchace, and the stampmaker which had their set price 100 Inkbucks also made 90 cents.)

Reasons:

1- Regional pricing is rough on people, I might be able to pay my real money and convert it to USD to pay for stamps, but 1 USD might be too much for someone living in brazil, India, russia, or simmilar countries with a lower currency value (i mention these two because they are price adjusted in some platforms because of currency value, see the picture below which is a steam DB screenshot) A user of these countries can choose to spend time making nice stamps, so they can buy their own stamps.

2- exchange rate/tax. Someone who wouldnt want to get paid by inkarnate but would like to buy stamps on Inkarnate has no way of doing so without real money transactions, and transactions means you now have to fill a personal income tax at the end of the year in some countries, and would mean that there is an exchange rate from USD to your currency either from the bank or paypal or similar.

3- transactions wouldnt be 1.36 cents for a set. you pay 10 dollars, your account is charged, you can buy as many stamps as you want with your wallet currency.