Problem
You need to issue credit to a customer account without collecting payment. This is due to the customer receiving a discount. You want it to be visible in the customer account.
Solution
Create a payment type to be used when issuing credit after a discount. You can label this payment type as Credit Issued.
Note: Set this payment type to export as Journal Entry so the credit gets exported to QuickBooks correctly.
Go to the customer profile and collect a payment.
On the Collect and Apply Payments screen, select the payment type you created in step 1 and enter the amount you want to issue to the customer as credit.
Select Apply to Customer Profile.
When finished, click Save.