We keep only what the game needs: the Steam account ID, game progress, purchases and an operation log. Payment details (card number and so on) are entered on the payment service's side and never reach us. Data are not shared with third parties, except the payment service for the order itself (number and amount). To delete your account data, write to the e-mail in the terms.
Seller: to be filled in, tax ID to be filled in. Contact: to be filled in