In Stax Bill, refund creation is a two-step process. Step 1 is to reverse the amount owed by the customer so the Stax Bill system knows the customer no longer owes for that money. Step 2 is to complete the refund. Step 1 is completed from the associated invoice, and Step 2 is completed from the customer's Payments page (select Payments in the left side menu --> select the "Details" button for the associated payment --> select the "Refund" button).