Three inputs to the retry schedule
Payday-aware timing
Payday-aware timing
Airdun estimates likely payday dates from the customer’s country and billing history, and holds the retry for the window when the account is most likely to have sufficient funds — typically just after a payday — rather than firing on a fixed day-3 schedule.
Country-aware retry windows
Country-aware retry windows
Salary cadences, bank processing times, and account replenishment patterns differ by market. Airdun applies country-specific retry windows and frequency limits rather than a single global default.
Failure-aware logic
Failure-aware logic
The retry approach depends on the failure reason:
- Expired card — retrying immediately cannot succeed; Airdun prioritizes outreach to prompt a card update before attempting again.
- Insufficient funds — retries are held and timed around likely payday dates.
- Bank block or do-not-honor — customer action is usually required; Airdun routes to outreach first and retries only after engagement signals.
- 3DS / authentication required — Airdun surfaces the authentication request through outreach rather than re-attempting without customer involvement.
Coordination with outreach
Smart Retries are not standalone. The retry schedule and the outreach sequence are timed together, so a customer receiving a payment reminder is also being retried at the moment that reminder is most likely to have had an effect.