The game is called Counter Strike: Global Offensive.

Good afternoon, I'm not good at writing TZ. Describe what I could )
There is a great website Text hidden right now, so I need almost the same with things from another game and no bets, just a sale. The point is that people sell things from the game to each other on the site. Paying for it with electronic money. They are credited first to their balance on the site, and after purchase are written off towards the seller.

For purchase, registration of all users on the site is required.
Authorization of the seller!! The site must be accessed via Steam Open id. What is it you can read here Text hidden
The buying-selling process.
Only proven people will sell things. They will need to be manually registered in the admin panel. Or just make a check on his profile.
A man puts his lot up for sale. The buyer clicks to buy the thing. Money from the buyer’s balance sheet is written off towards the seller. The product from the site disappears and the seller has a paid order. Which he then passes to the buyer.
I have something similar right now. You can take codes, scripts or whatever their name is from the site. You can see here Text hidden data for the entrance under the admin :
Login: Text hidden
Password: Text hidden
The balance will be replenished only through kiwis. Withdrawal, too. We'll do more webmoney in the future.
The seller's withdrawals also go to kiwi. Just on the site you need to make a form for sellers to apply for withdrawal.
As for the design, I think it should be like the official website Text hidden.
The priority of the performer from Moscow, to meet in person, to communicate. Because I understand the project is not simple, nor is it a solitary job. Always something will be added new and the old will be corrected.