http://prntscr.com/oeuz1j (check this image)

How it works:

1.) The buyer will list the item they want to buy, including the quantity and Crowns/energy/item trade they offer.

2.) After listing, the buyer's offers will be deposited on AH. They can cancel the items they listed and their offers will be refunded.

3.) For the sellers:

- If they clicked ✓ mark, this means they accept the deal and the trade will happen. The items will be mailed to the buyer and the offers will be mailed to the seller.

- If they clicked X mark, this means the buyer wants a better/different item offer.
The seller would list down a higher crown/energy or different item they want. The item they listed will notify the buyer.
The buyer will get notified of the condition through mail, they could either accept the condition by clicking "DEAL" or reject the condition by clicking "Reject Condition".

Example on link: http://prntscr.com/oeuz1j