My recollection is that a merchant can post a notice indicating that if an item is returned it can be resubmitted electronically and a charge may be imposed. However, the charge cannot be submitted as an electronic item.
The customer owes the merchant a fee. The customer owes you a fee. The customer is supplying the nails for his own crucifixion.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.