Reward points in money

Hello,

I want to know if is possible to convert Reward points in money?

I had make a lot of purchases from different stores where i recive points like 10 points for each purchase, and i can conver in my account this points in money and apply an discount to my purchase with them.

Example: 1 Purchase = 10 Points
10 Points = 1 Euro

Total cost of my purchase: 10 Euros, -1 Euro of my points.

The client can use or not this points (money) or can keep for next shop.

It is possible in opencart?

Regards