What Discover PM means
A double-payment claim across payment methods.
Common causes
- Customer paid by another card or bank transfer and the Discover card was also charged
- Multiple transactions not voided when the customer switched methods
Evidence that answers it
- Payment records showing only one payment for this order, or that the other payment was for another order
- Documentation that the cardholder agreed to the Discover charge
- Credit record if refunded
How to prevent it
- Void the card transaction when the customer switches payment method
- Reconcile all payments per order
How Verdikx helps with PM
Verdikx's paid-by-other-means playbook asks for the order's payment record and any separate orders from Shopify or your processor. If a second payment exists, it tells you to refund. You review the draft.
Frequently asked questions
What does Discover reason code PM mean?
Discover PM means the cardholder says they paid for the purchase another way, but the Discover payment was deposited as well. Win by proving the Discover charge was for a separate purchase, with transaction documentation showing the cardholder agreed to it, or by proving you already issued a credit for the disputed amount.
Is Discover PM worth fighting?
Our reference rates PM (Paid by Other Means) sometimes winnable, depending on the evidence you have. The evidence that answers it starts with payment records showing only one payment for this order, or that the other payment was for another order. The cardholder's bank decides the outcome.
How long does a cardholder have to file a Discover PM chargeback?
Usually 120 days from the transaction date, under the network's issuer time limits for most codes. Your processor gives you far less time to respond, so work from the due date on the case.
Answer your next PM with the right evidence.
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Sources
- Chase Merchant Services: Chargeback Reason Codes user guide (04/2018), Discover section (checked October 5, 2026)
- Solidgate Docs: Chargeback reason codes (Discover and American Express) (checked October 5, 2026)
Last reviewed by Verdikx Research.