Reference pagesReason codes
Consumer dispute
Discover DP: Duplicate Processing
A Discover dispute reason code, what it asks you to prove, and what Do The Proof puts in the response.
What this code means
Processed more than once
What the network says wins it
AUTH: separate transactions
- Authorization and processing records
Discover does not publish per-code dispute rules, so this page carries no quoted guidance on what wins.
How the app handles it
How long you have to respond
- Cardholder dispute window
- 120 days, or 540 days for non-receipt and quality, or 730 days for good faith
Where this comes from
- Stripe, reason code categories Accessed 8 September 2026.
Other Discover consumer dispute codes
Do The Proof drafts dispute responses for Shopify stores.
You pay when a dispute is won. Not before.