This is a point-and-reward system (more like a money back scheme or discount schemes) designed to increase sales and get new customers to sign up.
The system distributes purchase credits to customers for the amount they spend.
The points are seen as money when they are redeemed. The point must be approved by the administrator (manually) before they can be used.
Once the points have been approved, the customer can use these to pay for an order.
You decide how many points an order should give.
The points can then use by the customer to pay for an order at the store on another occasion.