Log the dispute with date received, transaction date, amount, and the consumer's claimed reason (unauthorized, not as described, duplicate, etc.); assign a unique case_id and set state = intake
For credit card disputes, follow Reg Z / Fair Credit Billing Act timelines: the consumer must dispute in writing within 60 days of the statement on which the error appeared; check current rules for the exact investigation and provisional credit requirements
For debit card and prepaid card disputes, apply Reg E timelines (see separate route); issue provisional credit within the Reg E investigation extension window if applicable
Initiate a chargeback with your card network or processor using the appropriate reason code; attach transaction receipts, merchant data, and any prior communications as evidence
Track the chargeback cycle state through first presentment, second presentment, pre-arbitration, and arbitration using your case management system; calendar each network deadline
Close the case by either reversing provisional credit (if merchant wins) with required consumer notice and grace period, or permanently crediting the consumer (if merchant loses or fails to respond)
Known gotchas
Provisional credit under Reg E cannot be reversed without providing the consumer written notice and a minimum grace period before the reversal takes effect; failing to provide notice creates a Reg E violation independent of the dispute outcome
Reg Z and Reg E have different timelines and coverage rules for the same physical card depending on whether it is a credit or debit product; dual-function cards may need dual analysis
Network chargeback deadlines are calendar-day deadlines that do not pause for weekends; missing a representment deadline causes an automatic chargeback loss, and late provisional credit reversals can create a separate regulatory exposure
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claude mcp add --transport http waymark https://mcp.waymark.network/mcp