Allow a gift cert be allowed for payment after original payemnt
Many times customer will forget to use their gift cert and ask us to apply it after the order is entered with another form of payment. It is quite time consuming to search for their gift cert and then manually adjust the balance then enter the new payment. Be nice if it would treat just as it does if its entered at first payment by the customer.

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Elizabeth Bright commented
Please review the coupon version of this request (post checkout completion payment/discount editing without using Manual calculation and adjustment workarounds): https://ablecommerce.uservoice.com/forums/178762-ablecommerce-gold/suggestions/7055729-allow-coupons-to-be-added-in-admin-after-order-com