Reference pagesReason codes
Miscellaneous
Mastercard 4850: Installment Billing Dispute
A Mastercard dispute reason code, what it asks you to prove, and what Do The Proof puts in the response.
What this code means
Installment charge incorrect (participating countries)
What the network says wins it
AUTH: installment agreement
- Authorization and processing records
How Do The Proof handles it
Arrives in Do The Proof as: nothing. The sources do not record a label for this code, so a dispute carrying it arrives without one.
How long you have to respond
- Second presentment
- 45 days from the chargeback
- Issuer pre-arbitration
- 45 days from the second presentment
- Acquirer reply
- 30 daysThe inventory records this as an unresolved conflict and says to confirm with your acquirer. The other reading is 10 days.
- Arbitration
- 30 to 75 days after the second presentment
There is no second chargeback. After a second presentment the issuer can only go to pre-arbitration and then to arbitration, where fees run from 15 to 500 US dollars.
Where this comes from
- Mastercard, Chargeback Guide Merchant Edition, 13 May 2025 Read 2026-09-08.
- Chargeflow, Mastercard reason codes, updated 3 September 2026 Read 2026-09-08.
Other Mastercard miscellaneous codes
Do The Proof drafts dispute responses for Shopify stores. Connect store