There are two options for changing a redemption rate for a customer,First option would be giving that customer a special rate or the other or the next option would be

On the Loan Payment Screen, you want to select the loan you are wanting to discount, Once you have done that you want to enter the full overdue amount, then

First you need to select “Retail Menu”, just like the image below. then once you have done that select the “Refund and Layby Cancellation”, like the image below. Then you