Electronic Goods vs quick buy

Hi all, we are new to open cart and amazed how easy and flexible this platform is. Short about us we are selling electronic goods such as serial numbers, key codes which do not require a shipping nor checkout process. We are aiming to make it very simple by removing the [Add to Cart] function. Instead as soon as anyone [Purchases] the item (if enough store credit is in place) the [Serial number/key] will be shown under the product description or popup message.

This will help our customers to save time as well as to continue our business model.

could anyone help us if this is possible? is there any extension available or can we request one through this forum?
many thanks
Krish