Spike risk is triple: first-order buyers (the [highest-dispute cohort](/blog/repeat-customers-dispute-less)) dominate, fraudsters use volume as cover, and fulfillment strain stretches delivery into [expectation-gap territory](/blog/shipping-speed-dispute-rates). The playbook: pre-stage inventory truth, hold expedited shipping promises you can't keep at volume, keep review capacity scaled to the spike, and over-communicate fulfillment status for the following two weeks.
The triple risk
- Cohort shift: spike buyers are ~90% first-order — roughly 5x baseline dispute probability before anything goes wrong operationally.
- Fraud cover: card testers and stolen-card users deliberately ride high-volume events, betting review standards drop when queues explode. They're usually right.
- Fulfillment strain: 10x orders against 1x pick-pack capacity stretches dispatch by days — into the delivery-anxiety window, at cohort scale.
Each alone is manageable; a spike delivers all three at once, and the disputes arrive as a coordinated wave 3–8 weeks later.
The spike playbook
- Before: verify inventory sync (an oversell cascade at spike volume is brutal), set checkout delivery estimates to strained-capacity reality, pre-arrange review coverage for the surge.
- During: don't loosen fraud rules to protect conversion — spike traffic is where they earn their keep. Disable same-day/expedited options if dispatch can't honor them at volume.
- After: ship in disclosed-window order, send proactive status at day 3–5 to the whole cohort, and watch the 3–8 week dispute tail with capacity ready.
Aurai absorbs both ends — Prevent screens the surge without a human queue, and representment scales to the tail without hiring. Spike economics without spike staffing.
Frequently asked questions
Why do disputes spike after viral sales days?
First-time buyers dominate spike cohorts (~5x baseline dispute risk), fraudsters use the volume as cover, and strained fulfillment stretches delivery into the anxiety window — all compounding.
Should I loosen fraud rules during a flash sale?
No — tighten attention instead. Fraud concentration rises during spikes precisely because attackers expect loosened review.
Post reflects public documentation, industry surveys, and Aurai's own book of disputes as of the publish date. Visa, Mastercard, American Express, Discover, Stripe, PayPal, and Shopify are trademarks of their respective owners; Aurai is independent and not endorsed by any of them. Network rules change — always verify current official rules before acting on any specific tactic.