Hi there!

So, I came with this idea in mind. I already searched around some things, like the Wordpress plugins and such, but couldn't find anything that really fits into my idea (or at least for free). What I want to do is:

1. Customer log in my store
2. Purchase one of my games
3. Get a key of the game(s) to Itch.io

• They can also check his/her account for keys they purchased before

1. I need to pay 30% withholding tax because I live in Brazil, plus the money conversion taxes and all the other taxes, making selling a game there too expensive
2. The major part of my customers also are from Brazil, Itch.io doesn't have local money available and they also doesn't offer local payment methods

I only know HTML, CSS and Javascript, I have no idea of how I could program this. Do you know any PhP free tutorials maybe? Free Wordpress plugins that have that system I described above?

Thanks in advance!

Good news there is a way but bad news, i cant find a free way to do it. Unless you know how selfhosting works and how to set it up, there really isnt much of a service that is willing to do it for free.