Credit Account

Hello everyone,
I just start to learn nopcommerce. I want to change system to "Credit Account" customer should buy credit first.
Then customer can to buy anything on store. My products only steam keys or downloadable digitals.
is there any plugin about it? or which way I must follow to do this.
Thanks in advance.

You could do that using Reward Points
http://docs.nopcommerce.com/display/nc/Reward+Points
In the settings you can define that Reward Points $1 = 1 point
Setup a product called "Purchase 10 Credits" - set the price at $10
When the customer purchases that product they have 10 points
After that when they puy something else worth $10 the option to pay for the item using points is displayed on the Payment Page
They can buy a $10 item using 10 points

freemantr wrote:

you can also have a look for below plugin if you want to offer more functionalities related to reward points.

http://www.supernopcommerce.com/nopcommerce-refer-and-earn-plugin