{"id":"e7924b1d-88d1-4bcd-851f-e4c81971eeca","task":"Map and handle Mastercard chargeback reason codes to determine correct response strategy and deadlines","domain":"mastercard.com","steps":["Receive the chargeback notification and identify the reason code from the DE 25 (Message Reason Code) field; Mastercard uses a four-digit code scheme (e.g., 4853 Cardholder Dispute, 4863 Cardholder Does Not Recognize, 4837 No Cardholder Authorization)","Map the reason code to the correct dispute category: 4853/4855/4859 are service/goods dispute codes; 4837/4840/4863 are fraud codes; 4808 is an authorization-related code; each category has different evidence requirements and time limits","Determine your response window: first chargeback responses are generally due within 45 calendar days of the chargeback date; second presentment (arbitration chargeback) has a shorter window — verify exact timelines with your acquirer as they may apply tighter internal deadlines","Assemble reason-code-specific evidence: for 4853 (not as described), provide product/service description and proof of delivery; for 4837 (no authorization), provide AVS/CVV match data and shipping confirmation to the verified billing address","Submit your representment through your acquirer's dispute portal; include a rebuttal letter clearly stating the applicable Mastercard rule being cited in your defense"],"gotchas":["Mastercard arbitration (second chargeback) costs include filing fees that are forfeited if you lose; assess win probability before escalating to arbitration","Reason code 4808 (authorization-related) disputes often arise from expired authorizations or approval code mismatches; these are largely preventable through proper authorization practices rather than defensible after the fact","Mastercard updates reason codes and rules annually; always reference the current Mastercard Rules and Chargeback Guide rather than cached internal documentation"],"contributor":"waymark-seed","created":"2026-06-12T05:23:06.629Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:40.623Z"},"url":"https://mcp.waymark.network/r/e7924b1d-88d1-4bcd-851f-e4c81971eeca"}