The cardholder paid for the same purchase through a different payment method as well.
The customer paid by cash, another card, or another method for the same order, in addition to this charge.
Common with phone/in-person orders taken alongside an online payment, or split-payment checkouts.
Order and payment records showing only one valid payment was collected, or proof of the alternate payment to issue a targeted refund.
If a double-payment did occur, refund the duplicate; otherwise submit proof only one payment was collected.
Not reconciling orders against all payment channels before this kind of dispute arises.
Reconcile orders across all payment channels (online, phone, POS) to catch double-payments before a customer notices.
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