Card Network References

Mastercard's chargeback reference covering processing cycles, cardholder dispute and fraud reason codes, second presentment, arbitration, supporting-document rules, and regional appendices.

Visa's main network rulebook covering participation rules, transaction processing, and the dispute framework.

American Express merchant-facing guide for responding to disputes and managing documentation.

Full reference of active chargeback reason codes for Visa, Mastercard, American Express, and Discover with category breakdowns, timelines, and practical tips.