Step 1: Navigate to the payments section.
Step 2: Click on add new adjustment.
Step 3: In the type field, select customer.
Step 4: Choose addition and apply it to the invoice.
Step 5: Provide a display text for the adjustment.
Step 6: If necessary, add any notes.
Step 7: Verify the invoice number and ensure it's for the correct customer.
Step 8: Click save. The adjustment will now apply to the customer's balance.
You'll see that the balance is now zero.
