How to make game currency to make money from it

I was wondering because like fortnite has game currency called vbucks which are used for cosmetics in the shop but people have to pay for vbucks how am I able to make that in my game where people can pay for my currency?

A video game currency seller will play a video game and earn a lot of virtual money on the game. Virtual money is earned by selling virtual items, getting achievements and generally playing the game often. When you earn the currency, you can then sell it online and then get real money instead.

There are many ways to make game currency, but some methods are more effective than others. One popular method is to create a virtual economy within the game that can be traded for real-world currency. This can be done by setting up a game store where players can buy and sell items, or by setting up a currency exchange where players can trade game currency for real-world currency. Another popular method is to create a game that allows players to earn game currency by completing tasks or challenges. This game currency can then be used to purchase items or experiences within the game, or it can be traded for real-world currency.