Online store for online games

I'll be selling things from the online game.
I need something like this:
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Not so squalid, not so squalid design. Just a pattern like that.

That is, the person enters, leaves his/her link to the exchange he/she takes from his/her playground account Texto oculto

He orders the item he likes, I receive an alert about the order and payment to the post office (with the lot number and its link to the exchange)

I will send the order number (and its link) to the item.

That's how I see it.

Maybe you can help me to develop the idea. Thank you!