Transfer Payment from One Invoice to Another

Steps to transfer a payment using gift certificates.

1. Select the original invoice that has the existing payment on it.
2. Click the 'Add Gift Certificate' button to add a gift certificate to the invoice. Make the value of the gift certificate the exact amount of the payment.
3. Now select the invoice that does not have the payment. Click on 'Make Payment' and use the newly created gift certificate as the form of payment.