Add the items the customer wishes to purchase to your cart (as you would for any other order).

REQUIRED: Assign the customer to the check out cart.

After adding the items to the cart, click "Total" at the bottom of the screen.

After clicking total, click Store Credit for the payment method on the total screen.

The POS will ask you what amount you want to apply to store credit. It will default to the entire purchase amount if enough store credit was previously issued.

When it is green, hit complete order and either print the receipt or email the receipt to the customer.